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以大量的岩心和测井资料为基础,利用铸体薄片、扫描电镜及压汞等测试分析方法,对坪北探区延长组长8和长9油层组的沉积环境、储层特征以及生储盖的组合关系进行了研究,结果表明长9期属浅湖相沉积,沉积物普遍较细,其顶部发育一套优质烃源岩,厚度5～14m,具有良好的供烃能力;长8期位于安塞三角洲沉积前缘,主要发育三角洲前缘水下分流河道和河口坝砂体,具有良好的储集空间,以原生残余粒间孔隙为主;区域内发育自生自储式、下生上储式、上生下储式3种成藏组合类型.根据坪北探区延长组长8、长9层试油成果,综合评价认为:坪北探区自生自储式成藏组合类型和下生上储式成藏组合类型具有良好的勘探前景,可通过实施滚动勘探进一步扩大含油面积,作为下一步开发的接替资源.
Based on a large number of core and well logging data, the depositional environment, reservoir characteristics and reservoir characteristics of Chang 8 and Chang 9 oil reservoirs in Pingbei exploration area are explored on the basis of a large number of test specimens such as cast thin films, SEM and mercury intrusion The results show that the Chang 9 period belongs to the shallow lacustrine facies, the sediments are generally thin, and a set of high quality source rocks are developed at the top of the reservoir with a thickness of 5 ~ 14m, Located in the sedimentary front of the Ansai delta, it mainly develops delta front subaqueous distributary channel and estuary bar sand body, which has good reservoir space with primary residual intergranular pores. In the area, self-generated self-storage and undergrowth According to the test results of Chang 8 and Chang 9 reservoirs in Pingbei Exploration Area, the comprehensive evaluation shows that the type and the type of spontaneous self-storage accumulation in Pingbei area The reservoir-type reservoir combination type has a good exploration prospect, which can further expand the oil-bearing area by implementing rolling exploration as a replacement resource for further development.