歧口凹陷古近系优质烃源岩发育控制因素浅析

摘要

The sedimentary thickness of Qikou Palaeogene sag is large ,and distribution is wide ,potential being great .But the difference of original sedimentary environment and late evolution degree in different area and strata makes the quality and distribution of hydrocarbon source rock greatly heterogeneous .The focus of this study is based on distribution of high -quality hydrocarbon source rocks and Hydrocar-bon generation environment .We have carried out the analysis of main controlling factors ,proposing that the high -quality hydrocarbon source rock develops in lake transgression event ;the developed extent of the high-quality hydrocarbon source rock is under the control of source conditions;The macroscopic distribution of the high -quality hydrocarbon is controlled by the Sedimentary medium conditions and Parent material types ;suitable sedimentary speed controls the developed position of the high -quality hydrocarbon source rock .Above anal-ysis provides objective basis for the subsequent oil and gas exploration work .%歧口凹陷古近系沉积厚度大，分布范围广，资源潜力大，但由于不同地区、不同层系原始沉积环境和后期演化程度的差异，使得烃源岩的质量和分布有着很强的非均质性。文章以优质烃源岩分布和成烃环境为研究对象，得出优质烃源岩分布的控制因素主要有：物源条件控制优质烃源岩发育程度，沉积介质条件和母质类型控制优质烃源岩宏观分布，适当的沉积速率控制优质烃源岩发育部位。