车镇凹陷下第三系沙河街组生烃系统研究

研究了济阳坳陷车镇凹陷下第三系沙河街组生烃系统，认为生油岩的发育和分布受控因素有盆地构造沉降、气候旋回变化、物源供给等作用。湖盆不同演化时期发育的沉积体系决定了不同成因类型的烃源岩和油气组合。沉积充填演化过程的阶段性和多旋回性，形成的多套富含有机质的有效烃源岩，组成了复合生烃系统。油源对比表明，沙四上、沙三段和沙一段3套烃源岩已形成一定规模油气聚集，部分油气藏存在混源现象。该凹陷的3个次级洼陷均发育不同成因类型的烃源岩，其中沙三段烃源岩对油气藏的贡献最大，因此深湖环境下发育的沙三段优质烃源岩成为车镇凹陷复式生烃系统的主力烃源岩。

HYDROCARBON-GENERATING SYSTEM OF EOGENE SHAHEJIE FM IN CHEZHEN SAG

Hydrocarbon-generating system of Eogene Shahejie Fm in Chezhen sag of Jiyang depression is studied in this paper. The development and distribution of source rock are believed being controlled by tectonic subsidence of basin, cyclic change of climate, source of sediments and others. Sedimentary systems that have been formed in different evolutionary stages of lake basin would have determined the genetic types of source rock and oil and gas combinations. Several sets of effective source rocks with rich organic materials that have been formed due to multiple phases and multicycle of sedimentary evolutionary process constitute a composite hydrocarbon-generating system. Oil-source correlation shows that hydrocarbons sourced from the upper 4~ th member, 3~ rd member and 1~ st member of Shahejie Fm have accumulated in pools of a certain size, some of which have mixed sources. Source rocks of various genetic types are developed in 3 sub-sags and the source rock in the 3~ rd member of Shahejie Fm would have contributed the most to the oil and gas pools. Therefore, the 3~ rd member of Shahejie Fm of deep lake facies is the main source rock of the composite hydrocarbon-generating systems in Chezhen sag.