| 塘沽地区湖相白云岩储层裂缝特征及其控制因素 |
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| 引用本文： | 赵耀,姚光庆,穆立华,李乐,王刚.塘沽地区湖相白云岩储层裂缝特征及其控制因素[J].地球科学,2016,41(2):252-264. |
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| 作者姓名： | 赵耀 姚光庆 穆立华 李乐 王刚 |
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| 作者单位： | 1.中国地质大学资源学院，湖北武汉 430074 |
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| 基金项目： | 中国石油股份有限公司大港油田分公司重点项目No.DGYT-2012-JS-566 |
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| 摘 要： | 塘沽地区沙三5油组属于断块、高压和裂缝型湖相白云岩油藏，裂缝成因复杂，控制因素多，目前的研究未见深入.从岩心、薄片、测井等资料入手，配合有限元模拟分析，研究塘沽地区湖相白云岩储层裂缝成因、期次，描述裂缝特征，分析成缝控制因素.研究表明:(1) 裂缝以构造缝为主，层理缝和溶蚀缝比例较少，渗流能力依次减弱；(2) 共发育4期裂缝:平行层面的层理缝；倾角为45°的共轭斜交缝、倾角为60°的高角度斜交缝；倾角为75°~90°的高角度/垂直张性裂缝；倾角70°~85°的高角度/垂直缝；(3) 构造、岩性、成岩和超压是湖相白云岩储层裂缝的主控因素，其对断裂和应力场的作用尤为明显；(4) 本区裂缝发育优势区主要集中在距离中部断垒近的2组近NW和NE向断裂交叉地带，油气勘探中应综合研究寻找上述裂缝发育区与高压地层配合的“甜点”区.
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| 关 键 词： | 裂缝 湖相白云岩 控制因素 塘沽地区 石油地质 |
| 收稿时间： | 2015-08-13 |
Characteristics and Controlling Factors of Fractures in Lacustrine Dolostones Reservoirs in Tanggu District |
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| Abstract: | The ${{\text{E}}_{1}}s_{3}^{5}$ member in Tanggu district is a fault block, high-pressure and fractured lacustrine dolostones reservoirs. Based on the core observation, thin sections and log data with Ansys, the authors study on the causes and formation periods of fractures in lacustrine dolostones reservoirs, describe the fracture characteristics and analyze the control factors of fractures. The results show that the fractures are mainly of the tectonic origin, with a few bedding fractures and dissolution fractures, and the seepage ability decreases successively. There are four stages of fractures development including bedding fractures parallel to beddings, oblique fractures with 45 and 60 degrees, tensile fractures with 75 to 90 degrees, and high angel fractures with 70 to 85 degrees. The structure, lithology, diagenesis and overpressure are the key control factors of fractures in lacustrine dolomite reservoir, which are obviously influenced by cracks and stress field. The fractures mainly develop near the fault cross zone with 2 groups of NW and NE trending faults, and the above mentioned fracture development zone with high pressure called the sweet spots should be valued in oil-gas exploration. |
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