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。
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.
作者
孟卫工
李晓光
吴炳伟
宫振超
董德胜
刘媛媛
咸秀明
Meng Weigong;Li Xiaoguang;Wu Bingwei;Gong Zhenchao;Dong Desheng;Liu Yuanyuan;Xian Xiuming(PetroChina Liaohe Oilfi eld Company)
出处
《中国石油勘探》
CAS
CSCD
北大核心
2021年第3期79-87,共9页
China Petroleum Exploration
基金
中国石油天然气股份有限公司重大科技专项“辽河油田千万吨稳产关键技术研究与应用”(2017E-16)。
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
Ordos Basin
Taiyuan Formation
aluminiferous rock series
porosity-fractured reservoir
self-generation and self-storage type assemblage
new field
