川东地区台洼边缘二叠系生物礁滩储层特征及控制因素

doi:10.3969/j.issn.1006-6535.2020.05.002

特种油气藏 ›› 2020, Vol. 27 ›› Issue (5): 7-13.DOI: 10.3969/j.issn.1006-6535.2020.05.002

川东地区台洼边缘二叠系生物礁滩储层特征及控制因素

蒋裕强^1,2, 刁志龙^1,2, 徐昌海³, 冯亮³, 谷一凡^1,2, 易娟子³

1.西南石油大学,四川成都 610500;
2.中国石油非常规油气重点实验室非常规储层评价实验室,四川成都 610500;
3.中国石油西南油气田分公司,四川成都 610051

收稿日期:2019-12-30 修回日期:2020-07-20 出版日期:2020-10-25 发布日期:2022-02-18
作者简介:蒋裕强(1963—),男,教授,博士生导师,1985年毕业于西南石油学院矿产普查专业,1993年毕业于该校矿产普查专业,获硕士学位,现从事复杂碳酸盐岩储层及非常规油气地质研究工作。
基金资助:
国家科技重大专项“四川盆地大型碳酸盐岩气田开发示范工程”(2016ZX05052)

Characteristics and Controlling Factors of Permian Reef Beach Reservoir in Platform-Depression Margin of Eastern Sichuan Basin

Jiang Yuqiang^1,2, Diao Zhilong^1,2, Xu Changhai³, Feng Liang³, Gu Yifan^1,2, Yi Juanzi³

1. Southwest University of Petroleum, Chengdu,Sichuan 610500,China;
2. Key Laboratory of Unconventional Oil and Gas, and Laboratory of Unconventional Reservoir Evaluation of CNPC, Chengdu,Sichuan 610500,China;
3. PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan,610051,China

Received:2019-12-30 Revised:2020-07-20 Online:2020-10-25 Published:2022-02-18

摘要/Abstract

摘要： 针对川东地区台洼边缘二叠系长兴组储层特征及主控因素认识不清的问题,运用薄片鉴定、岩心观察、常规物性分析等方法,讨论了生物礁滩储层特征及生物礁滩沉积、成岩改造对长兴组储层的控制作用。结果表明:研究区生物礁滩储层储集岩类型为生屑云岩及生物礁云岩,生屑云岩主要储集空间类型为晶间孔、晶间溶孔和非组构选择性溶孔(洞),生物礁云岩则为生物格架孔、非组构选择性溶孔(洞)。储层物性特征整体表现为低孔—中孔、低渗特征,储层控制因素则由沉积阶段物质基础和同生成岩阶段白云石化改造共同构成。沉积阶段沿台洼边缘高能带沉积形成了带状不连续生物礁滩,为后期白云石化改造提供了物质基础。同生成岩阶段形成的中等盐度海水,沿着未被第1期、第2期方解石完全胶结的礁滩原生孔洞空间渗流,对礁滩进行白云石化改造,是礁滩白云岩储层形成的关键因素。研究成果可为川东地区长兴组生物礁滩气藏的勘探拓展提供有力支撑。

关键词: 台洼边缘, 礁滩储层, 储层特征, 控制因素, 长兴组, 川东地区

Abstract: In view of the unclear understanding of the reservoir characteristics and main controlling factors of the Permian Changxing Formation in the platform-depression margin in eastern Sichuan Basin, this paper discusses the reservoir characteristics of the reef beach and the controlling effect of the reef beach sedimentation and diagenesis transformation on the Changxing Formation reservoir by using the methods of thin section identification, core observation and conventional physical property analysis. The results show that the reservoir rock types of the reef beach reservoir in the study area are bioclastic dolomite and reef dolomite. The main reservoir space types of bioclastic dolomite are intercrystalline pores, intercrystalline dissolved pores and non-fabric selective dissolved pores (vugs), while that of the reef dolomite consists of organic lattice pores and non-fabric selective dissolved pores (vugs). The reservoir physical properties are generally characterized by low-medium porosity and low permeability. The controlling factors of the reservoir include the material basis in the sedimentary stage and the dolomitization transformation in the syndiagenetic stage. In the sedimentary stage, along the high-energy zone in the platform-depression margin, belt-like discontinuous reef beaches were formed, which provided a material basis for dolomitization transformation in the later period. The medium-salinity seawater formed in syndiagenetic stage carries out dolomitization transformation on reef beaches along the primary pore spaces of reef beaches that have not been completely cemented by calcite of the first and second stages, which is the key factor for the formation of reef beach dolomite reservoir. The research results can provide strong support for the exploration expansion of reef beach gas reservoir in the Changxing Formation of eastern Sichuan Basin.

Key words: platform-depression margin, reef beach reservoir, reservoir characteristics, controlling factor, Changxing Formation, eastern Sichuan Basin

中图分类号:

TE122.2

蒋裕强, 刁志龙, 徐昌海, 冯亮, 谷一凡, 易娟子. 川东地区台洼边缘二叠系生物礁滩储层特征及控制因素[J]. 特种油气藏, 2020, 27(5): 7-13.

Jiang Yuqiang, Diao Zhilong, Xu Changhai, Feng Liang, Gu Yifan, Yi Juanzi. Characteristics and Controlling Factors of Permian Reef Beach Reservoir in Platform-Depression Margin of Eastern Sichuan Basin[J]. Special Oil & Gas Reservoirs, 2020, 27(5): 7-13.

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川东地区台洼边缘二叠系生物礁滩储层特征及控制因素

Characteristics and Controlling Factors of Permian Reef Beach Reservoir in Platform-Depression Margin of Eastern Sichuan Basin

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