鄂尔多斯盆地三叠系延长组长9油藏分布规律  

Distribution law of Chang9 reservoirs of Triassic Yanchang Formation in Ordos Basin

作　　者：杨亚娟[1,2] 张才利[1,2] 张艳[1,2] 张雷[1,2] 

机构地区：[1]中国石油长庆油田分公司勘探开发研究院 [2]低渗透油气田勘探开发国家工程实验室

出　　处：《低渗透油气田》2014年第1期8-13,5,共7页

摘　　要：从沉积、储层入手，分析了长9油藏成藏基本地质特征，归纳总结了油藏主控因素，认为盆地长9层主要发育三角洲相沉积，局部发育半深湖相沉积；储层物性总体较好，平面分区性明显，姬塬地区最好，洛川地区较差；油藏类型以岩性油藏为主，发育上生下储和自生自储两种成藏组合，东部志丹地区油源以长9为主，属自生自储组合，其余地区油源来自长7烃源岩，属上生下储组合；油藏主要赋存于长9，上部砂体中，油水分布关系以油水共存型为主；油藏分布受控于烃源岩、沉积成岩相带、物性等条件。综合研究认为，长9油藏是下一步勘探的理想层系。Proceeding from tbe deposition and reservoirs, basic geological characteristics of the Chang9 oil reservoir-forming is analyzed in the paper. The main controlling factors of the reservoirs are summarized. It is considered that there was mainly deltaic deposition developed in Chang9 reservoirs of the basin, with semi-deep lacustrine deposition locally developed. Physical properties of the reservoirs are overall good, with obviously planar parti- tions. Those in Jiyuan area are the best, while Luochuan area poor. Reservoir types are mainly lithologic reservoirs, with two source-reservoir-caprock assemblages （SRCAs） developed, that is, upper-generating lower-reservior and syngenetic SRCA. The oil source of Zhidan region in the eastern basin takes Chang9 as the dominated, being syngenetic SRCA, while the other oil snurce from Chang7 source rock, being the upper-generating lower-re- servior SRCA. The oil mainly occurs in the sand-body of the upper Chang91 reservoirs. The oil-water distribution relationship is mainly oil-water coexist type. The oil reservoir distribution is controlled by the source rock, sedimentary diagenetic facies tracts, physical properties and other conditions. Comprehensive studies suggest that, Chang9 reservoirs is ideal series of strata for the next exploration.

关 键 词：鄂尔多斯盆地 延长组 长9油层 成藏特征 油水关系 分布规律 

分 类 号：TE121[石油与天然气工程—油气勘探]