四川盆地拔山寺向斜泰页1井页岩油气重大突破及意义

doi:10.3969/j.issn.1672-7703.2021.02.003

摘要/Abstract

摘要： 2021年1月，在四川盆地涪陵北部拔山寺向斜针对侏罗系凉高山组实施的第一口页岩油气探井——泰页1井，通过水平井钻井及分段压裂测试，试获日产气7.5×104m3、日产油9.8m3，实现了侏罗系凉高山组湖相页岩油气新层系勘探重大突破。基于泰页1 井的钻探成果，系统分析了涪陵北部地区凉高山组湖相页岩油气成藏条件和富集规律。研究表明：泰页1 井突破层系为凉高山组二段（凉二段）半深湖相富有机质泥页岩，其中④小层厚度约为25.2m，TOC 均值大于1.5%，有机质类型以Ⅱ型为主，R o 为1.25%～1.45%，孔隙度平均为3.52%，以无机孔（黏土矿物层间孔、粒间孔、粒内孔等）为主，仅局部发育有机质孔，孔隙类型以介孔（孔径为2～50nm）和大孔（孔径>50nm）为主，含气量约为1.81m3/t，相对于其他小层而言，④小层泥页岩连续厚度最大、TOC 和孔隙度最高、含气性最好，为自生自储的“纯页岩型”页岩油气藏；涪陵北部地区半深湖相优质页岩分布广泛，有利于页岩油气富集，其中保存条件好、地层高压、微裂缝发育区有利于页岩油气高产；探索形成了以“少段多簇+ 暂堵转向+ 大排量+ 中粗砂强加砂”为主要特点的体积压裂关键技术，可实现陆相页岩的有效改造。泰页1 井的突破对于中国湖相页岩油气的商业开发具有重要意义。

关键词: 四川盆地, 侏罗系, 凉高山组, 重大突破, 成藏条件, 富集高产

Abstract: In January 2021, Well Taiye 1, the first shale oil and gas exploratory well targeting at the Jurassic Lianggaoshan Formation,
was deployed in the Bashansi Syncline in the northern part of Fuling area in the Sichuan Basin, and obtained oil and gas flow rate of 9.8 m3/d and 7.5×104 m3/d respectively, by multi-staged fracturing and testing of the horizontal section, indicating a major breakthrough in lacustrine shale oil and gas exploration. Based on drilling results of Well Taiye 1, hydrocarbon accumulation
conditions and enrichment rules of lacustrine shale oil and gas in the Jurassic Lianggaoshan Formation were analyzed in detail.
Results indicate that the producing layer in Well Taiye 1 is organic rich shale in the 2nd member of Lianggaoshan Formation
(Liang 2 member) developed in semi-deep lake facies. In this layer, the 4th sub-layer is about 25.20 m in thickness, with the average TOC greater than 1.5%, organic matter type predominated by Type II, Ro ranging from 1.01%?1.41%, gas content of 1.81 m3/t, and an average porosity of 3.52%. Inorganic pores are dominant (clay mineral interlayer pores, intergranular pores, intragranular pores, etc.), and organic pores are developed locally, with pore diameter mainly of mesopores (2?50 nm) and macropores(>50 nm). Compared with other thin layers, the 4th sub-layer has the largest continuous thickness, the highest TOC, porosity, and gas content, representing a self-generation and self-storage shale oil and gas reservoir of “pure shale type”. The high-quality semi-deep lacustrine shale are widely developed in the northern part of Fuling area, which is favorable for shale oil and gas enrichment.The area with good preservation conditions, high formation pressure, and well-developed micro-fractures are conducive to the high production of shale oil and gas. Key technology of volume fracturing with characteristics of “few stages and multi cluster + temporary plugging and diversion + high pumping rate + medium to coarse sand proppants and high intensity sand injection” has been researched and developed, which enables effective stimulation on lacustrine shale. In conclusion, breakthrough of Well Taiye 1 is of great significance to the commercial development of lacustrine shale oil and gas in China.

中图分类号:

TE122

胡东风, 魏志红, 刘若冰, 魏祥峰, 刘珠江, 陈斐然. 四川盆地拔山寺向斜泰页1井页岩油气重大突破及意义[J]. 中国石油勘探, 2021, 26(2): 21-32.

Hu Dongfeng, Wei Zhihong, Liu Ruobing, Wei Xiangfeng, Liu Zhujiang, Chen feiran. Major breakthrough of shale oil and gas in Well Taiye 1 in Bashansi Syncline in the Sichuan Basin and its significance#br#[J]. China Petroleum Exploration, 2021, 26(2): 21-32.

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