The fault sealing evaluation is an important aspect on exploration and development of carbonate, while few related studies have been performed at home and abroad. Based on mudstone profile and carbonate profile analysis, and carbonate fault sealing mechanism studies, six kinds of evaluation methods of carbonate fault sealing were put forward as follows: the gypsum gouge ration, the shale or gypsum content of fault filling materials, the compressive strain of fault plane, the formation pressure differential on both sides of the fault, the formation water property and field production performance. Some of which are not only applicable to the carbonatite area, but also suitable for other clastic sedimentary areas.

渤海湾盆地济阳坳陷三合村洼陷古近系与新近系均发育大量稠油油藏,明确油气成因机制和成藏过程对下一步油气勘探具有重要意义.利用原油生物标志化合物特征,明确了稠油油藏的成因机制,结合构造演化史、埋藏史—热史、油气成藏期次等研究,恢复了稠油油藏的形成过程.结果表明,古近系与新近系稠油油藏具有“泾渭分明”的成因机制和运聚特征:古近系东营组沉积末期,渤南洼陷沙四段烃源岩生成的低熟原油通过古近系沙三段与前古近系之间的不整合输导层侧向运移至三合村洼陷,在古近系沙三段底部的地层超覆圈闭中聚集成藏,形成原生型稠油油藏;新近系馆上段—明化镇组沉积时期,渤南洼陷沙三段和沙四段烃源岩生成的成熟原油首先侧向运移至垦西断垒,进而通过垦西断层垂向运移至新近系馆陶组,最后通过馆陶组骨架砂体及断层的复合输导进入三合村洼陷,在馆陶组构造—岩性圈闭或地层超覆圈闭中聚集成藏,由于后期强烈的生物降解作用而形成次生型稠油油藏.开展稠油油藏与浅层气藏的联合勘探,可作为济阳坳陷浅层今后增储上产的勘探新领域.

济阳坳陷三合村洼陷古近系发育稠油,但其成因机制尚不明确,制约了该区稠油的勘探与开发.通过42个稠油样品的物性、族组成以及地球化学分析,结合烃源岩生排烃史以及原油运聚特征,探讨了三合村洼陷古近系稠油的成因机制.结果表明:渤南洼陷沙四段烃源岩具备低熟油的生烃条件;古近纪东营组沉积末期,沙四段膏盐湖相烃源岩进入低成熟演化阶段,成化还原环境的早期生烃作用促使其生成低熟油;热化学硫酸盐还原作用造成原油密度、黏度、硫含量增大,这些原油通过古近系与前第三系之间的不整合输导层近距离运移至三合村洼陷古近系沙三段地层圈闭中聚集成藏,由于埋藏较浅,后期遭受轻微生物降解作用而进一步稠化.综上所述,三合村洼陷古近系稠油为低熟油经热化学硫酸盐还原作用、生物降解作用稠变而成,属于原生蚀变型稠油.

渤海湾盆地济阳拗陷浅层稠油十分发育,储量巨大,是今后勘探开发的重要目标.利用色谱、色谱—质谱等技术方法,结合原油微生物降解模拟实验,系统阐述了济阳拗陷生物降解原油的地球化学特征.结果表明:①济阳拗陷生物降解原油总体上遭受了中等—严重程度的生物降解作用,造成饱和烃含量低、芳烃含量高、非烃+沥青质含量高的特征;②多数原油正构烷烃损失严重,部分残留少量类异戊二烯烃;甾烷类化合物发生不同程度降解,重排甾烷、孕甾烷相对含量随降解程度的增加而降低;萜烷类化合物以三环萜烷为主,三降藿烷Ts丰度普遍低于Tm,伽马蜡烷含量相对较高,部分萜烷中出现25-降藿烷系列;耐降解的芳烃类化合物也遭受了后期改造作用.基于稠油油藏与浅层气藏的成因关系、量化关系及分布关系,结论认为:由已知稠油油藏顺源寻找关联未知浅层气藏或由已知浅层气藏逆源寻找关联未知稠油油藏的联合勘探将是立体勘探的必由之路.

不整合储层形成机制有别于常规储层,成岩作用对其物性具有十分重要的影响.在岩心观察的基础上,进行了普通薄片、铸体薄片、扫描电镜等分析测试,开展了准噶尔盆地西北缘三叠系顶部碎屑岩不整合储层的成岩作用特征研究,并探讨了成岩作用对储层物性的影响.不整合储层主要经历了压实作用、胶结作用、溶蚀作用和破裂作用等成岩作用,现处于中成岩A亚期,岩石蚀变程度具有随距不整合面距离的增加而减弱的变化规律.成岩作用对储层物性具有明显的影响,压实作用和胶结作用使孔隙减少,物性变差;溶蚀作用和破裂作用使孔隙增加,物性变好.成岩作用对不整合储层物性影响的相对强弱顺序依次为压实作用、溶蚀作用、胶结作用和破裂作用.

断裂-不整合输导体系是黄骅坳陷埕北断阶带油气运聚成藏的重要条件:古近系沙河街组沙二、三段底部的不整合与中深部断裂组成的输导体系是沟通歧口凹陷和歧南凹陷沙河街组油源向中部沙河街组和东营组及下部中生界运移的主要通道,而新近系馆陶组底部的区域不整合与中浅部断裂组成的输导体系是馆陶组和明化镇组油气成藏的主要通道.

The interlayers of inner buried hills are the main factors that control the hydrocarbon distribution. Starting from the exploration practice in Jizhong depression,this paper studies the characteristics of lithology, resistivity,seismic reflection and distribution of interlayers using the seismology,geology,logging and assay data.The result shows that the interlayers of inner buried hills in Jizhong depression have multiple types of rocks with preferable sealing ability.The distribution characteristics of interlayers in horizontal and vertical directions influence the hydrocarbon distribution of the inner buried hill reservoir.According to the relationship of interlay-er and hydrocarbon,the patterns of hydrocarbon distribution can be classified into four main types,i.e.top barriering,bottom barriering,lateral barriering and top-bottom sandwich.Explorations should be focused on the deep inner traps in the central uplift belt,and the inner traps of the slope belt and the fault step belt.

It is difficult to explore the buried hill reservoir in Jizhong Depression because of the strong heterogeneity of carbonate reservoirs and the complex hydrocarbon distribution. The theories and methods of petroleum geology, geophysics and organic geochemistry, combined with exploration practice, were applied to systematically study the charac-teristics of buried hill reservoir in Jizhong Depression. The result shows that the hydrocarbon in buried hill mainly came from the source rocks of Eogene and Permo-Carboniferous system. The reservoir is composed of Middle-Upper Praterozoic and Lower Paleozoic carbonate rocks, and pores, caves and fractures are the main reservoir spaces. The cap rocks are composed of argillaceous rocks of Eogene, coal measure strata of Permo-Carboniferous system and interlayers of inner buried hills, and there developed eight sets of reservoir-cap rocks assemblage. The faults and unconformities are the main hydrocarbon migration pathways of buried hills. The buried hill reservoirs can be divided into hilltop type, hillside type and inner buried hill type. The buried hill reservoirs are mainly located in eastern depressed areas, and distributed close to fractural belts near source rocks, forming the complex hydrocarbon accumulation belts. These research results will be helpful for the disclosure of hydrocarbon accumulation rules, and provide guidance for the target evaluation and favorable zone selection.

After 8 yearl,high speed and high efficiency exploitation in Block 1/2/4 Sudan,it has entered high water cut development,and there will be more complex problems to be faced,such as the obvious decline of oil field production and more difficulty in stabilizing production.According to this situation,comprehensive research on reservoir geology,dynamic analysis on development performance and fine reservoir numerical simulation is conducted to determine that remaining oil mainly distributes vertically on the top of the reservoir,and horizontally in sparse pattern areas,high positions of local structures and near faults.Comprehensive adjustment strategies and measures,such as well pattern infilling,horizontal well,lifting with electric submersible pump,water plugging,reperforating and sidetrack low effect well etc.are implemented on this basis,and oilfield application acquires preferable effectiveness.A whole set of high efficiency development technology for strong bottom water driving block-shaped reservoirs is formed.

为深入了解CO2吞吐过程中各种注采工艺参数对高凝油藏开发效果的影响,针对某高凝油藏的地质及油藏特征,在PVT实验和相态拟合数据的基础上,建立了数值模拟模型.在此基础上进行了数值模拟计算,分析了5个敏感因素对开发效果的影响.研究结果表明,对于高凝油藏,CO2吞吐的注入速度、注入时间、焖井时间、井底流压等参数都存在最佳范围,最佳注气速度为60 000 m3/d,最佳注入时间为40 d,最佳焖井时间为16d,生产时合理的井底流压为600 psi,计算比较了5个吞吐轮次的吞吐生产效果,从换油率指标来看前3个吞吐轮次的效果最好.

介绍了苏丹P油田的开发策略和综合应用现代油藏管理技术的情况,根据该油田开发的特殊性,研究了适合该油田的高效开发配套技术,实现了合理、高效、快速和科学地开发油田.

The faulting systems and their distribution characteristics in Chengbei fault-ramp area are described. The sealing and the transport properties of the faults and their influencing factors as well as the control effects on petroleum distribution of the studied area are analyzed. Three transport patterns of vertical, lateral and stepped faults are put forward. Three different reservoir-forming patterns and their characteristics formed by the different fault translocations in this area are reviewed.

The geological conditions of Sichuan gas field are complicated, including obvious low porosity and permeability, a strong heterogeneity, and the fractures having different fracture growing degrees.Because of locally active edge or bottom water, it breaks through into the gas reservoir along larger fractures, making the production of gas wells greatly reduced and the gas wells water-flooded. It also damages gas reservoirs and decreases the recovery factor. It is very important for early water control in aquifer gas reservoirs to use the early production testing data for studying the aquifer behavior and water invasion performance. Based on material balance equations, a new method for prediction of water invasion performance of fractured gas reservoirs is presented in the paper. By this method calculation of water invasion rate by introducing the water invasion factor is avoided. A nonlinear optimization solution procedure is employed and the proposed solution has more improvement than traditional method. A field example is presented that illustrates the capabilities of this water invasion prediction method for the analysis of past performance of fractured and watered reservoirs. Real case study indicates that the method can acquire the aquifer behavior and water invasion performance exactly and the results are useful to the measures for water invasion.

This paper evaluates the development effect of 300m area in Sadong transitional zone of Sanan development area in Daqing Oil Field. According to actual development status, it constructs an evaluation index system, and determines the weight vector using hierarchy analysis method to compensate the lack of weight vector which is difficult to be determined using weighed averaging method and grey relative analysis method. At the meantime of evaluating water flooding development effect, it performs multi-hierachy fuzzy determination for artificially controlling factors influencing development effect.