从营城组、沙河子组、火石岭组建组标准剖面分析入手,综合运用岩性地层对比、生物地层对比、同位素年代对比等综合性地层对比方法,总结了松辽盆地南部深层各组段地层特征.初步确立了地层划分对比标准,对生产起到了有力的支撑作用.

In the Songliao Basin,a large number of ostracod fossils were deposited in the Upper Cretaceous Qingshankou Formation.Single layer thickness of ostracod layers ranges from 5 to 200 cm.Ostracod layer has typical logging character of a low gamma,high electric resistance and low AC.Based on identifying the ostracod layers by logging data,studies have been carried out about ostracod fossil distribution in different facies and in the vertical high-frequency sequence stratigraphic framework.Furthermore,reasons of ostracod extinction event are analyzed.In plane,ostracod layers are mainly distributed in depression-surrounding areas of Daqing,Longhupao-Honggang terraces and Heidimiao;while they are poorly developed in the eastern basin.Shore-shallow lacustrine is a favorable environment for the survival of ostracods.Vertically,ostracod layers are mainly distributed in the upper part of Member 1 and Member 2 of Qingshankou Formation,not well developed in the Member 3 of Qingshankou Formation.High-frequency sequence cycle controls the reproduction and death of ostracods.Ostracod extinction event often happened during the period of base-level falling.Ostracod extinction event has nothing to do with the expanding of lake area,also has nothing to do with the transgression.It may be directly related with the decline of base-level,which causes water shallowing,salinity increasing,and sand extending into the shore-shallow lake.

Compared with general seismic techniques,VSP can remove noise effect more effectively and improve vertical resolution.Combining 3D seismic profile and core,the key layers are calibrated,their relations can be made definitely,and fine seismic attributes analyses is processed.Amore accurate geological model is set up and the reservoir heterogeneous can be made clearly by using VSP image.Taking Nanshanwan area for example,the thin sand of Putaohua oil layer can be recalibrated using VSP time-depth table,and its bottom can be interpreted accurately.The reservoir is predicted by several attributes analyses,and sedimentary facial map is established to put forward favorable exploration targets.

Regional geological features of Jilin peripheral basins are analyzed, it is inferred that the development and evolution of the peripheral basins are controlled by regional structural movement. Multiple peripheral basins have become multi-type superimposed basins after experiencing Paleozoic marine deposition and Meso-Cenozoic continental deposition. The basic petroleum geological conditions of peripheral basins are analyzed systematically. Two big oil and gas exploration fields are found in the basins, i.e. the Paleozoic marine carbonate exploration field and the Meso-Cenozoic continental exploration field, both of which have broad prospect for exploration. It is clear that both marine and continental exploration, both Paleozoic and Meso-Cenozoic exploration should be laid the same emphasis.

On account of the difficult questions of a strip of double-fault-style rift basin-Yitong Basin stratigraphic correlation, this article, studies the features of the secondary and tertiary sequence boundary and sets up a sequence stratigraphic framework on the basis of the analysis of the regional structure, stratigraphy, sediment characteristics. Authors believe that Tf surface ultimately belongs to the secondary sequence surface through a comprehensive analysis of a number of ways, however, it is not the regional unconformity; authors have finally solved the attribution problem of the Y1 formation by the comparison of Tc, Td unconformity level .Using of logging, drilling, seismic and other data, combining with seismic and wells, suming up the characteristics of each sequence stratigraphy, systematically dividing and comparingthe formation ofYitongBasin, the standards ofdivision and correlation ofvarious layer are set up.

Experiments were conducted on the sensitivity of different samples of clay minerals,their parameters and their physical property respectively,combined with the analysis data of casting thin sections and SEM,so as to understand the affecting factors and establish the prediction model of sensitivity in Liangjia-Xin′anpu district.The relations between the reservoir sensitivity and the sedimentary facies,porosity,permeability,relative content of clay minerals,throat types,structural parameters of pore,occurrence of clay minerals and the moisture of reservoir rock,were analyzed.A sensitivity prediction model by using multiple regression methods was established in the aspect of speed sensitivity,water sensitivity,acid sensitivity and alkali sensitivity respectively.It was showed that there were strong water sensitivity and speed sensitivity in the area and the degree of sensitivity was increasing from braid river sediments to lake sediments.The porosity,permeability,contents of different kind of clay minerals were important parameters for reservoir sensitivity in this area,and the predicting results with this model has a 75 percent precision.

The depositional basin often has two or more than two temperature-pressure systems, including one temperature-pressure system of shallow-formation and one or more than one temperature-pressure systems of deep-formation. The temperature and the formation pressure keep the line relationship in the same temperature-pressure system, but in different temperature-pressure systems, the line slope of temperature-pressure relationship is different. The authors analyse Moliqing Sag's temperature-pressure system characters in Yitong Graben. There are two superimposed temperature-pressure systems in the shallow and deep formations of Molingqing Sag. The deep one is prone to high pressure. It is also showed that Shuangyang Group, the west of Moliqing Sag, is the low temperature and high pressure zone; the northwest is the low temperature and low pressure zone; Maanshan fault belt is the normal temperature and normal pressure zone; Jianshan uplift fault belt is the high temperature and low pressure zone. The vertical and planar distribution characters of temperature-pressure systems have some influences on the formation and distribution of petroleum pool.

The reservoir-forming mechanism of Fuyu Formation in southern Songliao Basin was studied from the aspects of depositional reservoir character,overpressure of source rock,power of hydrocarbon migration and hydrocarbon distribution.According to this result,the vertical migration mode of low-permeability reservoir and the reservoir-forming pattern of overpressure controlled lithologic reservoirs are established,by which a great exploration potential of low-permeability reservoir is forecasted,and it has great significance in the guidance of exploration in this area.

The southern part of Chaluhe fault depression of Yitong Graben,controlled by faults in northwestern graben and fault 2,can be divided into two structural units: Liangjia structural zone and Xin' anpu depression.On the basis of systematically structural interpretation of 3D seismic data,the area can be further divided into three structural zones: rolling anticline zone,block fault uplift zone and strike slip fault depression zone.The types and distribution of sedimentary facies in the area are main controlled by tectonic activities of southeastern fault,northwestern fault and the fault 2.According to the different structural and sedimentary features,there exist three types of hydrocarbon reservoirs: fault-lithology hydrocarbon reservoir in northwestern border fault,fault-block hydrocarbon reservoir in central uplift belt and structure-lithology composite hydrocarbon reservoir controlled by the fault 2.

According to integrated analysis of geology,drilling and seismic data etc.,the lower Tertiary may be divided into one megasequence, six ultrasequences,and twelve tertiary sequences.Based on sequence stratigraphic framework,combing with packing characteristics of sedimentary sequence and areal distribution rule of system tract in the basin,different types of sedimentary sequence and system tract models are generalized,including third break type developed in Liangjia region at the stable tensional stage,regulating basin developed in Wanchuang region,and sedimentary sequence model of deep water basin developed in Botai region.Various types of quadrants developed at lower water level,including low water fans,low water wedge,braided channel and lower cutting valley backing sand,will become favorable oil beds,and form subtle trap or compound traps.Twelve favorable regional belts are predicted in this paper.

伊通地堑二号断层是依通地堑一条重要的断层,分隔鹿乡断陷及岔路河断陷,断层两侧发育有梁家和五星两个重要的含油气构造带.本文通过高质量的三维地震资料的精细解释,研究了二号断层的几何学特征,分析了其空间变化特征、动态演化特征及其与油气运聚关系,认为二号断层不仅横切伊通地堑,而且具有控盆作用,向东与岔路河断陷的东部边界断层连为一体,其演化经历了早期张扭作用及晚期压扭作用,对两侧构造带发育具有明显控制作用,同时认为该断层是一条重要的油源断层,对油气成藏有重要控制作用.

Strike-slip basins are commonly complex, mainly because of its complicated fault system and tectonic style. Based on systematic structural interpretation with 3D seismic data and analysis on regional geology and drilling data, the fault system and tectonic style of the Yitong Graben are studied. It is shown that the fault system of the Yitong Graben is mainly composed of EW strike extensional normal faults and NE strike wrench faults, and reflects a right lateral strike-slip stress field. There are four evolution types of faults, and well matched with the basin formation and evolution. The main tectonic style of the graben is the basement involved, and is strike-slip and pull-apart origins, and can be subdivided into 5 types. There is only one dominant tectonic type in each fault depression. The difference of the tectonic styles is the main reason which causes each fault depression to have its own oil distribution law.

伊通盆地可以划分出莫里青一鹿乡断陷E2s、E2sh含油气系统和岔路河断陷E2s、E2sh含油气系统2个含油气系统及岔路河断陷E2s、E2sh、E2y-E3w复合含油气系统;在分析含油气系统形成的条件及含油气系统内油气富集带、油气藏的分布特征基础上,结合前人的研究成果,提出下步勘探方向.

The geochemistry characters are discussed which between mudstones from deep lacustrine facies and coal measured by hydrous pyrolysis.Lots of differences of the two samples are pointed out by analysis.The mudstones from deep lacustrine facies and coal measure show difficult evolution features by hydrous pyrolysis. The mudstone from deep lacustrine facies has high hydrocarbon yield and is more profitable to liquid oil generation,so it will mainly generate liquid oil in the course of thermal evolution.The saturated hydrocarbon content is more and the nonhydrocarbon content is lower in the residual dissoluble organic matter in the mudstone from deep lacustrine facies than that in coal measures.The ratio of resin to asphalten and the ratio of saturated hydrocarbon to aromatics increase when the temperature rises in the mudstone from deep lacustrine facies.The ratio of resin to asphalten increases and the ratio of saturated hydrocarbon to aromatics varies little or decreases a little when the temperature rises in the mudstone from coal messures. T max of the pyrolyzed(Rock-Eval) mudstones from deep lacustrine facies can not indicate evolution stage,but T max of the pyrolyzed(Rock-Eval) mudstones from the mudstone from coal measures increases as the temperature rises.The carbon isotope of kerogen from the mudstone from deep lacustrine facies is lower distinctly than that of kerogen from mudstone of coal measures. The carbon isotope of kerogen from two samples becomes heavy as the temperature rises.It is obvious that the T max of the mudstone from deep lacustrine facies should be considered carefully when it is used to rekon the maturity of organic matter,and that the variation of isotope carbon of kerogen should also be thought much when it is used to research the type of organic matter.

The path of oil and gas migration is called a carrying bed. Through an investigation, it is shown that there are three types of carrying beds, i. e. sandbody reservoir, basement rock unconformity and fault, in Yilan-Yitong Basin. The sandbody reservoir and basement rock unconformity may be mainly taken as the paths of lateral oil and gas migration, and the fault may be taken as both a barrier and path of oil and gas migration, being dependent on the character and activity strength of the fault. As the path of migration, the fault is mainly taken as the path of vertical oil and gas migration or plays a role in hydrocarbon's being directly lost at the surface. Yilan-Yitong basin may be divided into three second-order tectonic units, such as Chaluhe, Luxiang and Moliqing Depressions. Controlling the oil and gas migration, accumulation and distribution, the carrying bed systems in the three depressions are different from each. They are: 1. the oil and gas migration and accumulation in Moliqing Depression were mainly at a short distance, and the basement rock unconformity and fault created conditions for a relatively long-distance migration also; 2. Member Shuang-2 sandstone is an excellent carrying ded that caused the oil and gas generated in Danan Seg of Luxiang Depression to be massively migrated toward Wuxing structural belt; and 3. the fault in Chaluhe Depression is taken as the path of vertical oil and gas migration, playing a dual role, i. e. either making the deep-buried reservoirs be destroyed or making the shallow reservoirs be formed.

From the early days of 50s, 20th century, sediment gravity flows have been rec-ognized widely by sedimentologists ,especially from the end of 60s,submarine fan related nearly to sediment gravity flows has been the hotspot of sedimentology field. Through the summary of a large of research accompliments of sediment gravity flows and submarine fan China and abroad, integrated with the development characteristics of submarine fan in Cenozoic - Mesozoic rupture basins China, rock facies of submarine fan are classified into matrix cement conglomer-ate rock, grain surported conglomerate rock, conglomerate - sandstone, massive sandstone and classical turbidite. The formation of submarine fan related to sediment gravity flows. The char-acteristics of inner fan is combination of matrix cement conglomerate rock and grain supported conglomerate rock, middle fan is combination of conglomerate - sandstone and massive sand-stone,outer fan is classical turbidite.