鄂尔多斯盆地东韩油区延长组长7—长9油气成藏条件及主控因素

doi:10.3969/j.issn.1673-8926.2018.01.003

岩性油气藏 ›› 2018, Vol. 30 ›› Issue (1): 30–38.doi: 10.3969/j.issn.1673-8926.2018.01.003

鄂尔多斯盆地东韩油区延长组长7—长9油气成藏条件及主控因素

曹跃¹, 刘延哲¹, 陈义国¹, 孟旺才¹, 高鹏鹏²

1. 陕西延长石油(集团)有限责任公司研究院, 西安 710075;
2. 西安石油大学石油专门用途英语研究中心, 西安 710065

收稿日期:2017-07-27 修回日期:2017-09-26 出版日期:2018-01-21 发布日期:2018-01-21
第一作者:曹跃(1966-),男,高级工程师,主要从事石油天然气地质综合研究工作。地址:(710075)陕西省西安市高新区科技二路75号延长石油集团研究院。Email:861025850@qq.com。
基金资助:
国家重大科技专项“构造成藏耦合与岩性油气聚集区预测方法——以鄂尔多斯盆地中生界为例”（编号：20011ZX05001-003-3）和延长石油集团课题“鄂尔多斯盆地延长探区三叠系延长组勘探潜力分析及有利目标选择”（编号：ycsy2012ky-A-13）联合资助

Hydrocarbon accumulation conditions and main controlling factors of Chang 7-Chang 9 oil reservoirs of Yanchang Formation in Donghan region,Ordos Basin

CAO Yue¹, LIU Yanzhe¹, CHEN Yiguo¹, MENG Wangcai¹, GAO Pengpeng²

1. Research Institute of Shaanxi Yanchang Petroleum Group Co., Ltd., Xi'an 710075, China;
2. English for Special Purposes Research Centre, Xi'an Shiyou University, Xi'an 710065, China

Received:2017-07-27 Revised:2017-09-26 Online:2018-01-21 Published:2018-01-21

摘要/Abstract

摘要： 东韩油区长7—长9油层组（以下简称长7—长9）勘探认识程度低，为了搞清下部地层油气成藏条件及主控因素，利用87口综合录井和测井，以及15口钻井薄片鉴定、物性分析、试油测试等资料，并应用致密油气成藏地质学理论，开展了烃源岩、沉积微相、岩石学特征及储集性能、泥岩盖层等方面的成藏条件分析，从油藏分布与烃源岩、沉积微相、构造、盖层等方面探讨了油藏的主控因素。结果表明：①研究区发育长7和长9共2套烃源岩，其中长7为主力烃源岩，长9为对油区具有一定的贡献烃源岩，发育水下分流河道和水下分流间湾等沉积微相，水下分流河道中的细砂岩为主要储层，岩石类型以岩屑质长石砂岩为主，物性条件差，湖泛期沉积的泥页岩和分流间湾泥岩为主要盖层；②烃源岩、沉积微相、三角洲前缘水下分流河道叠合连片的岩性变化带、鼻状隆起带等的有效匹配是长7—长9致密砂岩能否成藏及取得突破的关键；③研究区发育2种成藏组合类型，其中长7以自生自储型成藏组合为主，长8、长9以上生下储型成藏组合为主。以上认识对该区深部勘探部署或类似地区的研究具有借鉴作用。

关键词: 碳酸盐岩, 声波测井, 频谱分析, 各向异性

Abstract: The exploration degree is still low in Chang 7-Chang 9 oil reservoir of Upper Triassic in Donghan region of Ordos Basin. Based on the drilling and logging data from 87 wells and thin section observation,physical property analysis and oil test for 15 wells,under the guidance of geology theory of tight hydrocarbon accumulation,the source rocks,sedimentary microfacies,reservoir properties and cap rock were studied,and the main controlling factors of reservoir were discussed in terms of reservoir distribution,source rocks,sedimentary microfacies, structure and cap rock. The results show that:(1)Two sets of hydrocarbon source rocks are developed in Chang 7 and Chang 9 oil reservoirs,with Chang 7 source rock being the main source rocks. Subaqueous distributary channel and subaqueous interdistributary bays are developed,the fine sandstone in subaqueous distributary channel is the main reservoir,and lithic feldspathic sandstone is the main rock type,with poor physical properties. Mud shale deposited during the lake flooding period and mudstone in distributary bay are the main cap rocks; (2)The effective matching among hydrocarbon source rocks,sedimentary microfacies,superimposed contiguous lithologic changing zones of subaqueous distributary channel in delta front,and nose uplift zones,is the key for reservoir-forming and exploration breakthrough of tight sandstone.(3)There are two types of hydrocarbon reservoir assemblage,the type of self-generation and self-storage is dominated in Chang 7 oil reservoir,and the type of upper-generation and lower storage is dominated in Chang 8 oil reservoir. The results are helpful for guiding the deep exploration and deployment in this area,and also have reference significance for similar areas.

Key words: carbonate rocks, acoustic logging, frequency spectrum analysis, anisotropy

中图分类号:

TE122

曹跃, 刘延哲, 陈义国, 孟旺才, 高鹏鹏. 鄂尔多斯盆地东韩油区延长组长7—长9油气成藏条件及主控因素[J]. 岩性油气藏, 2018, 30(1): 30–38.

CAO Yue, LIU Yanzhe, CHEN Yiguo, MENG Wangcai, GAO Pengpeng. Hydrocarbon accumulation conditions and main controlling factors of Chang 7-Chang 9 oil reservoirs of Yanchang Formation in Donghan region,Ordos Basin[J]. Lithologic Reservoirs, 2018, 30(1): 30–38.

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鄂尔多斯盆地东韩油区延长组长7—长9油气成藏条件及主控因素

Hydrocarbon accumulation conditions and main controlling factors of Chang 7-Chang 9 oil reservoirs of Yanchang Formation in Donghan region,Ordos Basin

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