Igneous intrusions may contain sufficient heat that can have an effect on the generation of hydrocarbons from the source rock. This model is tested in the Yingtai Fault Depression of the southern Songliao Basin, where intrusive rocks are abundant. A heat conduction model and kinetic models of hydrocarbon generation are calibrated by using the hydrocarbon yield data from pyrolysis experiment and vitrinite reflectance values of source rocks adjacent to intrusive rocks. Our analysis shows that the intrusive rock contributes to the hydrocarbon generated from organic matter in the neighboring rock nearby the intrusive rock. For instance, as the distance to the contact surface is decreased, the maturity of the organic matter of neighboring rock increases gradually, H/C and TOC decreases gradually. The results have revealed that the extents affected by intrusive rocks with different thicknesses at various initial temperatures are basically not more than twice of the thickness of the intrusive rock. For multiple intrusive rocks, the extent and the degree of the thermal effect during a contemporaneous emplacement and emplacement at different stages are obviously different. The extent and degree of the thermal effect during contemporaneous emplacement are normally large. The degrees of thermal effect are different for neighboring rocks with different initial maturity, which is affected by the intrusive rock with the same parameters (such as thickness or initial temperature). Setting 0.9 % as the maturity (Ro) limit, atmaturity less than 0.9 %, the Ro thermal effect (increment amount of Ro) increases as the initial maturity of the neighboring rock rises. At maturity of more than 0.9 %, it decreases as the initial maturity of neighboring rock rises. The results of the geological application have shown that the hydrocarbon generation history of source rock in an area with intrusive rocks can be solved effectively by an integrated use of the heat conduction model and the kinetic model of hydrocarbon generation.

Description of the geometric model of the fan delta single stage fan is the key geological technology which solving the development of Haita oilfield. Regarding high-resolution sequence stratigraphy and modern sedimentary theory as the guidance,we identify 3 long terms,4 middle terms, 6 short terms,and 53 super short terms (equivalent to single sand body)base-level cycles in N2 of Nantun Group in Bei 301 region Huhenuoren oilfield.We also establish the monosandbody rank high-resolution sequence stratigraphic framework in encrypted development zones of Haita basin for the first time.The study of sendimentary micro-facies shows underwater distributary channel and microfacies for river mouth bar which are full of favorable sandbodies mainly develop in the little accommodate space that near the turnaround serface of SSC3,SSC4,SSC5 and SSC6.The width and thickness ratio for the single underwater distributary channel is generally between 50∶1 and 200∶1 ,the average value is about 85∶1.With the decreasing of the base level,the width of underwater distributary channel is increased, and the thickness is thickened,and the width and thickness ratio is increased.With the rising of the base level,the width of underwater distributary channel becomes narrower and the thickness is decreased,and the width and thickness ratio is decreased.The distribution area and thickness of river mouth bar has a certain positive correlation.The radius and thickness ratio is between 60∶ 1 and 120∶ 1,the average value is about 90 ∶ 1. This research established the industrial drawing of monosandbody rank sendimentary micro-facies in Haita basin for the first time,described geometry characteristic of the main monosandbody and provided the geological basis for comprehensive development.

To solve the precise interconnection relations of single sand bodies between the wells that restricted oilfield development of the complex faulted oil fields,this research is directed by the high resolution sequence stratigraphy and the modern sedimentological theory,comprehensive application of drilling,logging,seismic and analysis assay data,then first time build single sand body rank high-resolution sequence stratigraphic framework for the second member of Nantun Formation in Bei 301 block of Huhenuoren Oilfield in Haita Basin.Identify that it is on the fan delta front background,with the decreasing of the base level,the width of underwater distributary channel is increased and the thickness is thickened.With the rising of the base level,the width of underwater distributary channel become narrow and the thickness is decreased.Favorable sandbodies mainly developed in the little accommodate space that near the turnaround surface of MSC2.The study result and method provide beneficial reference for studying fine reservoir description in other region.

High-resolution sequence stratigraphy study of single sand body have a significant meaning for accelerating,deepening and rolling the geological characteristics cognition of early exploration and development of Hailaer Basin.Using methods and principles of high-resolution sequence stratigraphy,combining drilling,logging,seismic and analysis assay data,two long-terms,4 mid-terms,8 short-terms and 46 ultra-short terms of base-level cycles are recognized in Second Member of Nantun Formation of Su 31 Block of Hailaer Basin.Sand body and oil-bearing sand bodies mainly develop in middle to late period of each middle base level decreased half-cycle and the early period of middle base level increased half-cycle of late period of LSC1 decreased half-cycle,early to middle period of LSC2 increased half-cycle.The degree of sand development and sand types and physical properties and oiliness become gradually good with base level decreasing.The degree of sand development and sand types and physical properties and oiliness become gradually bad with base level increasing.

In order to evaluate and recognize the exploration potential of fault depressions except for the middle part fault depression where had a great breakthrough, the geological and geochemical data from the risk exploration well-Longshen 1, qualitative appraisement and quantitative calculation method are used to study gas source conditions and the exploration potential of Yingtai fault depression. This research indicates that dark mudstones of K1yc and K1sh layers are relatively development and the residual organic carbon content is relatively higher, and the organic matter is mainly at high-to over-mature evolution stage, especially with type Ⅱ1 and Ⅱ2 organic matter which have a higher gas generation potential, other than the type III organic matter accepted by predecessor. All above evidence hints there is a better exploration potential in deep fault depression. Meanwhile, the original carbon content and hydrocarbon potential of organic matter are much higher than present values, which indicate the signification of restitution for the objective appraisement of high-over-mature source rock. Quantitative appraisement preliminarily reveals that the gas resource of Yingtai fault depression is ranger from 93.8 to 375.8 billion cubic meters, where has a gas source condition for forming medium to large-sized gas fields or groups. It also means that some fault depressions have important and exploratory exploration potential, besides Xujiaweizi and Changling fault depression.

Based on substantial experimental material of reservoir,porosity and permeability parameters of the volcanic reservoir and the quantitative evaluation parameters of heterogeneity of Well Longshen 1 field of Yingtai fault is analyzed.The results show that volcanic reservoir physical properties change a lot in space.It has a strong non-homogeneous.This makes an effective reservoir prediction of volcanic difficulty.Using the imaging logging,indoor rock identification and casting thin section analysis,this study explores the mechanism and process that the various factors on the formation and transformation of the volcanic reservoir space,points out that lithology of the volcanic rocks is the base of other parameters having an impact on the reservoir properties.Volcanic subfacies are the main control factors of physical,diagenetic and tectonic aspects are an important factor on the physical properties,this makes an effective volcanic reservoir prediction have regulations to abide by.

The Longshen 1 well marks the breakthrough for deep gas exploration in the Yingtai depression in southern Songliao basin,and the ascription of its deep horizon is a key to the resource evaluation and reserve prediction in the Yingtai depression.The deep horizons in the Longshen 1 well were further subdivided by using rock-electric characteristics,correlation between wells,sporopollen assemblages and log and seismic data.The generalization is as the followings: the Yingcheng Group of the Longshen 1 well consisting of two set of thick volcanic(igneous rock) and two set of thin sedimentary rocks.They are significantly different from both the underlying and overlying layers in lithology,electrical property and seismic features.Its sporopollen characteristics were also distinct to those of the upper and lower formations,with gymnospermae pollen being up 65% and pteridophyta spore 35%,comparable to those of the Yingcheng Group in the northern Songliao basin.The top and bottom boundary of the Yingcheng Formation in the Longshen 1 well were 2 895 m and 3 532 m respectively and the Shahezi Formation has not been cut throught.

In application to high-resolution sequence stratigraphy principles and methods,forty one short-term base-level cycles and seven middle-term base-level cycles and two long-term base-level semi-cycles in Fuyu oil layer of Chao 1 Chao gas 3 blocks of Chaoyanggou oil field are identified.By the sedimentary dynamics analysis of genesis of multiage base-level cycles,quantitative analysis of the core testing and statistical data which characterize the macroscopic heterogeneity of the reservoir,we point out that with the uprising of the long-term base-level cycle,in-layer heterogeneity of short-term base-level cycles becomes stronger,and interlayer heterogeneity of middle-term base-level cycles becomes weaker,and plane heterogeneity of short-term base-level cycles becomes stronger.With the subsiding of the long-term base-level cycle,every trend is contrary.By analysis,the changes of sedimentary environment that are caused by the changes of base-level cycles and associated accommodation are the determinative factors for feature differences of reservoir macroscopic heterogeneity.

Applying the principles and methods of high-resolution sequence stratigraphy,and combining with the data of exploration wells and development wells in encrypted network of wells,the authors identified 41 short-term base-level cycles of 7 types,which were formed under the conditions of deeping upward,shallowing upward,symmetrical in different accommodation space in Fuyu oil layer of Chao 1-Chao gas 3 blocks,and makes detailed analysis on the genesis and characteristics based on the sedimentary dynamics.According to the structural feature and stacking pattern of short-term base-level cycle,the authors established seven medium-term base-level cycles and identified two long-term base-level hemicycles by accompanying local indicator layers,and thus established the high-resolution sequence stratigraphic framework.In the study area,sand body is generally absent in the long-term base-level fall hemicycles,but in the early long-term base-level rise hemicycles,the thickness and effective thickness of sand of river-facies are significant,ratios of sand to mud are high,oiliness is good,and with the long-term base-level rising,the sedimentary environment turned to the delta system,the shore lake and the shallow lake,sand and oiliness gradually decrease.Moreover,each medium-term base-level,sand and its oilness in the transform zone from subsidence to elevation developed relatively best in the whole medium-term base-level cycle.