鄂尔多斯盆地宁古3井太原组含铝岩系天然气成藏特征及地质意义

doi:10.3969/j.issn.1672-7703.2021.03.007

摘要/Abstract

摘要： 位于鄂尔多斯盆地伊陕斜坡西南缘的宁古3井在二叠系太原组含铝岩系天然气勘探中获得重大突破，发现了新的气藏类型，改变了长期以来对含铝岩系不能形成有效储层的传统地质认识。为进一步评价含铝岩系勘探潜力，寻求规模资源发现，开展了含铝岩系储集性、含气性及天然气成藏特征研究。通过区域地质背景分析，利用钻井、录井、测井和分析测试资料，对宁古3井太原组含铝岩系成藏条件进行研究，探讨天然气成藏模式。研究结果表明，太原组含铝岩系由铝土岩、铝土质泥岩、砂岩、凝灰岩薄互层构成，受沉积作用和构造作用双重控制，发育孔隙—裂缝型储层，储集空间主要为残余粒间孔、粒间溶孔、晶间孔和微裂缝；其与二叠系煤系烃源岩互层共生或直接接触，形成源内自生自储式成藏组合；受印支期—燕山期构造活动影响，断层—裂缝发育，有效改善储层输导油气能力，“源、储、缝”耦合关系是成藏的关键。宁古3井的成功勘探，拓展了鄂尔多斯盆地天然气勘探领域，展示了含铝岩系具备规模储量发现的潜力及广阔的勘探前景。

关键词: 鄂尔多斯盆地, 太原组, 含铝岩系, 孔隙—裂缝型储层, 自生自储式成藏组合, 新领域

Abstract: Major breakthrough has been made in natural gas exploration of aluminiferous rock series of Permian Taiyuan Formation in Well Ninggu 3 in the southwestern Yishan Slope, which alters the traditional understanding that aluminiferous rock series can’t form effective reservoir. In this paper, research on reservoir quality, gas-bearing properties and gas accumulation characteristics has been carried out to further evaluate the potential of aluminiferous rock series and search for large-scale discovery. By using the regional geology, drilling, logging and testing data, gas accumulation conditions and pattern of aluminiferous rock series of Taiyuan Formation in Well Ninggu 3 has been studied in detail, which shows that (1) aluminiferous rock series consist of thin interbedding of bauxite, bauxitic mudstone, sandstone and tuff, and porosity-fractured reservoir is developed controlled by sedimentation and tectonism with main reservoir space of residual intergranular pore, intergranular dissolution pore, intercrystalline pore and microfracture; (2) The aluminiferous rock series is paragenetic or directly contacted with Permian coal measure source rocks, forming self-generation and self-storage type source rock-reservoir assemblage;(3) Influenced by the Indosinian-Yanshanian tectonic movement, faults and fractures are well developed, which effectively improve the hydrocarbon transport capacity. In a word, the coupling relation between “source rock, reservoir and fracture” is the key for gas accumulation. The discovery of Well Ninggu 3 expands gas exploration field in the Ordos Basin, and shows great potential and broad prospect of aluminiferous rock series.

Key words: Ordos Basin, Taiyuan Formation, aluminiferous rock series, porosity-fractured reservoir, self-generation and self-storage type assemblage, new field

中图分类号:

TE122.1

孟卫工, 李晓光, 吴炳伟, 宫振超, 董德胜, 刘媛媛, 咸秀明. 鄂尔多斯盆地宁古3井太原组含铝岩系天然气成藏特征及地质意义[J]. 中国石油勘探, 2021, 26(3): 79-87.

Meng Weigong, Li Xiaoguang, Wu Bingwei, Gong Zhenchao, Dong Desheng, Liu Yuanyuan, Xian Xiuming. Research on gas accumulation characteristics of aluminiferous rock series of Taiyuan Formation in Well Ninggu 3 and its geological significance, Ordos Basin[J]. China Petroleum Exploration, 2021, 26(3): 79-87.

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