吐哈盆地胜北洼陷七克台组二段致密油成藏条件

doi:10.12108/yxyqc.20200609

岩性油气藏 ›› 2020, Vol. 32 ›› Issue (6): 97–108.doi: 10.12108/yxyqc.20200609

吐哈盆地胜北洼陷七克台组二段致密油成藏条件

冯越^1,2, 黄志龙^1,2, 李天军^1,2, 张华³, 李宏伟³, 周亚东³

1. 中国石油大学 (北京)地球科学学院, 北京 102249;
2. 油气资源与探测国家重点实验室, 北京 102249;
3. 中国石油吐哈油田分公司勘探开发研究院, 新疆哈密 839009

收稿日期:2020-03-16 修回日期:2020-03-30 出版日期:2020-12-01 发布日期:2020-10-30
第一作者:冯越(1995-),男,中国石油大学(北京)在读硕士研究生,研究方向为含油气盆地分析。地址:(102249)北京市昌平区府学路18号。Email:2408367665@qq.com。
基金资助:
国家重大科技专项“岩性地层油气藏区带、圈闭评价方法与关键技术”（编号：2017ZX05001-003）资助

Tight oil accumulation conditions of the second member of Qiketai Formation in Shengbei sub-sag，Turpan-Hami Basin

FENG Yue^1,2, HUANG Zhilong^1,2, LI Tianjun^1,2, ZHANG Hua³, LI Hongwei³, ZHOU Yadong³

1. College of Geoscience, China University of Petroleum(Beijing), Beijing 102249, China;
2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
3. Research Institute of Exploration and Development, PetroChina Tuha Oilfield Company, Hami 839009, Xinjiang, China

Received:2020-03-16 Revised:2020-03-30 Online:2020-12-01 Published:2020-10-30

摘要/Abstract

摘要： 为了深入分析吐哈盆地胜北洼陷七克台组二段致密油成藏条件与主控因素，有效促进致密油勘探，开展了岩心观察、薄片鉴定、扫描电镜观察、高压压汞和有机地球化学分析等研究。结果表明： ①七克台组二段发育一套微咸水湖相低熟烃源岩，TOC质量分数平均值为1.78%，有机质以Ⅰ型和Ⅱ₁型为主，烃源岩品质良好。②七克台组二段中部发育一套致密混积岩储层，孔隙度为2.6%～7.8%，渗透率普遍< 1.0 mD，孔隙结构及连通性中等，允许流体流动的孔喉直径下限为50 nm，可动流体孔隙度下限为2.6%，致密油可动性较强。③优质烃源岩分布、油源断裂、有利沉积相带共同控制了致密油藏的分布，具有“自源供烃、断-缝输导、优势相带控藏”的特征，根据控藏要素可划分出2类致密油勘探有利区。该研究成果对促进吐哈盆地胜北洼陷致密油勘探具有指导意义。

关键词: 致密油, 成藏条件, 七克台组二段, 胜北洼陷, 吐哈盆地

Abstract: In order to analyze the conditions and main controlling factors of tight oil accumulation of the second member of Qiketai Formation(J₂ q₂)in Shengbei sub-sag of Turpan-Hami Basin,and effectively promote the scale effect of tight oil exploration,core and thin section observation,scanning electron microscopy(SEM), high-pressure mercury injection and organic geochemistry analyses were carried out. The results show that:(1)The J₂ q₂ source rock is a set of low-mature high-quality source rocks,which deposited in a slightly reduced brackish lake environment,the average TOC of source rock is 1.78%,and the organic matter is mainly of type Ⅰ and type Ⅱ₁.(2)A set of tight mixed rock reservoir was developed in the middle of the second member of Qiketai Formation,with porosity ranging from 2.6 to 7.7% and the permeability less than 1.0 mD. The overall performance was characterized by medium reservoir pore structure and connectivity. The cut-off pore-throat radius and lower limit of porosity are 50 nm and 2.6%,respectively,and the mobility of tight oil is relatively strong. (3)The distribution of high-quality source rocks,oil-source faults and favorable sedimentary facies belts control the tight oil accumulation,which has the characteristics of "self-source hydrocarbon supply,fault-fracture transportation and reservoir control of favorable facies belt". According to the reservoir controlling factors,two kinds of favorable areas for tight oil exploration can be divided. The research results have important guiding significance for promoting the exploration of tight oil in Shengbei sub-sag of the Turpan-Hami Basin.

Key words: tight oil, accumulation conditions, the second member of Qiketai Formation, Shengbei sub-sag, Turpan-Hami Basin

中图分类号:

TE122.2

冯越, 黄志龙, 李天军, 张华, 李宏伟, 周亚东. 吐哈盆地胜北洼陷七克台组二段致密油成藏条件[J]. 岩性油气藏, 2020, 32(6): 97–108.

FENG Yue, HUANG Zhilong, LI Tianjun, ZHANG Hua, LI Hongwei, ZHOU Yadong. Tight oil accumulation conditions of the second member of Qiketai Formation in Shengbei sub-sag，Turpan-Hami Basin[J]. Lithologic Reservoirs, 2020, 32(6): 97–108.

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吐哈盆地胜北洼陷七克台组二段致密油成藏条件

Tight oil accumulation conditions of the second member of Qiketai Formation in Shengbei sub-sag，Turpan-Hami Basin

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