川中—川南过渡带嘉二段储集性及储层控制因素研究

RESERVOIR AND CONTROLLING FACTORS OF THE SECONDARY MEMBER OFTHE JIALING RIVER FORMATION IN THE HIT AND THESOUTH TRANSITION STRIP OF SICHUAN

嘉二段是川中—川南过渡带嘉陵江组最发育的层段,嘉二时期该区主要发育台内滩、台坪、局限泻湖、半局限泻湖、开阔潮下沉积亚相。认为不同亚相类型的孔隙度值说明该区嘉陵江组台内滩亚相和台坪亚相的云坪微相为最有利的储集相带,但由于后期成岩作用的改造,不同储集相带可以相互转化,故该段储集性主要受沉积相类型、同生期溶蚀作用、埋藏溶蚀作用和构造破裂作用等因素控制。结合该区实际情况,将嘉二段储层划分为好、较好、一般、非储层4种。

The Jia-2 member is the best developed segment in the Jialing River formation of resourceful region. The Jia-2 member develops the enclosed sands, platform, restricted lagoon, half-restricted lagoon and open subtidal sedimentary subfacies mostly. The different porosity show that the enclosed sands subfacies and the platform's dolomite flat microfacies in the native Jialing River formation is the best reservoir facies belt. But because of the alteration caused by the diagenesis in anaphase, the different reservoir facies belt can transform together. Therefore this segment's reservoir is mainly controlled by the tape of the sedimentary facies, the effect of syngenetic solution, the embedding solution and the structure burst and so on. According to this area's condition, the Jia-2's reservoir was divided to good, better, ecumenical and non-reservoir four types.