鄂尔多斯盆地南部延长组长8油层组差异成藏过程研究
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作者单位:

1.中国石油大学北京油气资源与探测国家重点实验室 北京;2.西安石油大学地球科学与工程学院 陕西 西安

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中图分类号:

TE122.1

基金项目:

国家自然科学基金项目(41872148)


Research on Differential Reservoir Forming Process of Chang 8 reservoir in Yanchang Formation, South Ordos Basin
Author:
Affiliation:

1.State Key Laboratory of Petroleum Resources and Exploration,China University of Petroleum Beijing;2.School of Earth Sciences and Engineering,Xi'3.'4.an Shiyou University,Xi'5.an

Fund Project:

The National Natural Science Foundation of China (41872148)

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    摘要:

    鄂尔多斯盆地南部延长组长8油层组为岩性油藏,其在东部富县地区和西部庆阳地区勘探成果和成藏过程存在差异,究其原因,对长8油层组的沉积规模、储层特征、成藏年代进行了研究,总结出富县和庆阳两个地区在不同时期运聚成藏模式的差异性。结果表明:(1)富县地区和庆阳地区分别发育三角洲前缘沉积相和辫状河三角洲沉积相,庆阳地区沉积规模小于富县地区;(2)由于受到沉积作用和成岩作用的影响,总体上庆阳地区储层物性比富县地区差;(3)富县地区经历了2期油气充注,第1期油气充注为晚侏罗世-早白垩世,第2期油气充注为早白垩世中期,庆阳地区主要经历了1期油气充注,成藏时间为早白垩世中期;(4)东、西部运聚成藏存在差异:在晚侏罗世,富县地区长9作为主要的供烃来源,长9油气沿砂体向长8油层组进行运移,同时也可在其内部进行长距离的侧向运移,而庆阳地区此时长9源岩生烃强度不大,只有少量油气沿砂体进入长8储层,成藏组合为下生上储;在早白垩世,庆阳地区构造活动强烈,长7和长9作为主要的供烃来源,油气沿断裂带进行大量充注,成藏组合为下生上储和上生下储,而富县地区此时长7源岩有油气生成,但由于断裂带不发育,油气充注相对庆阳较弱。明确了盆地南部延长组长8油层组东、西部成藏差异,归纳了油气运聚成藏模式,其研究成果对指导盆地石油勘探部署提供重要依据。

    Abstract:

    The Chang 8 reservoir of Yanchang Formation in the southern Ordos Basin is a lithologic oil reservoir, and there are differences in the exploration results and accumulation processes in the Fuxian area in the east and Qingyang area in the west. The characteristics and age of accumulation were studied, and the differences in the migration and accumulation patterns of Fuxian and Qingyang in different periods were summarized. The results show that: (1) Delta front sedimentary facies and braided river delta sedimentary facies are developed in Fuxian area and Qingyang area respectively. The sedimentary scale in Qingyang area is smaller than that in Fuxian area. (2) Due to the influence of sedimentation and diagenesis, the reservoir physical property in Qingyang area is worse than that in Fuxian area; (3) Fuxian area experienced two periods of hydrocarbon charging, the first period of hydrocarbon charging is late Jurassic-Early Cretaceous, the second period of hydrocarbon charging is middle Early Cretaceous, Qingyang area mainly experienced the first period of hydrocarbon charging, and the accumulation time is middle early Cretaceous. (4) There are differences in migration and accumulation between east and west: in the Late Jurassic, Chang 9 in Fuxian area as the main source of hydrocarbon supply. Chang 9 hydrocarbon migration along to the chang 8 reservoir sand body, at the same time can also be used in its internal for the lateral migration of long distance, but the hydrocarbon generation intensity of the Chang 9 source rock in Qingyang area was not strong at this time, and only a small amount of hydrocarbon entered the Chang 8 reservoir along the sand body, and the accumulation combination was lower generation and upper storage; in the Early Cretaceous, tectonic activity was strong in Qingyang area, Chang 7 and Chang 9 are the main sources of hydrocarbon supply, and a large amount of hydrocarbon was charged along the fault zone. The hydrocarbon accumulation assemblages ware lower generation - upper storage and upper generation - lower storage. However, the Chang 7 source rock in Fuxian area was hydrocarbon generation at this time, but the hydrocarbon charging was weaker than that in Qingyang area because the fault zone was not developed. The difference in accumulation between the east and west of Chang 8 reservoir of Yanchang Formation in the southern Ordos Basin are clarified, and the hydrocarbon migration and accumulation model are summarized. The research results provide an important basis for guiding petroleum exploration and deployment in the basin.

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张思玉,庞雄奇,丁超,等. 鄂尔多斯盆地南部延长组长8油层组差异成藏过程研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-10-06
  • 最后修改日期:2022-05-05
  • 录用日期:2022-05-07
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