| 准噶尔盆地腹部侏罗系超压特征和测井响应以及成因 |
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| 引用本文： | 何生,何治亮,杨智,武恒志,王芙蓉,石万忠.准噶尔盆地腹部侏罗系超压特征和测井响应以及成因[J].地球科学,2009,34(3):457-470. |
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| 作者姓名： | 何生 何治亮 杨智 武恒志 王芙蓉 石万忠 |
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| 作者单位： | 1.中国地质大学构造与油气资源教育部重点实验室, 湖北武汉 430074 |
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| 基金项目： | 教育部高等学校博士学科点专项科研基金，中国石化西部新区勘探指挥部项目，国家自然科学基金重点项目 |
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| 摘 要： | 准噶尔盆地腹部地区深层钻井揭示侏罗系发育异常高压系统.根据26口井的67个钻杆测试(DST) 和电缆测试(MDT) 数据, 实测砂岩异常高压揭示深度约在4470~6160m, 剩余压力约为11~57MPa, 压力系数为1.24~2.07, 砂岩段超压实测值主要分布在侏罗系, 少数出现在白垩系底部与侏罗系邻近地层, 1个超压实测值位于下三叠统, 实测超压砂岩样品的孔隙度和渗透率范围分别为3.20%~16.00%和0.02×10-3~14.40×10-3μm2;根据钻井、测井和测试资料的综合解释, 埋深在4430~6650m的深部侏罗系流体超压带, 钻井泥浆密度明显增加, 泥页岩和砂岩共同具有相对于正常趋势的异常高声波时差和低视电阻率测井响应特征; 超压系统顶界埋深可能不浅于4400m (地温约104℃), 有些钻井超压顶界可深达约6000m (地温约140℃), 且超压带顶界深度随侏罗系埋深的增加而增大; 钻井揭示的侏罗系超压带烃源岩镜质体反射率(Ro, %) 约为0.7%~1.3%, 超压带分布深度受控于侏罗系成熟烃源岩层的埋深且两者深度分布的变化具有相关性; 研究认为腹部地区已被充分压实的侏罗系异常高压成因主要与其含煤岩系干酪根热演化及油气共生有关, 即生烃增压; 物理模拟实验表明, 由于高孔隙流体压力可导致岩石骨架颗粒间有效应力的减小, 从而直接引起通过岩石的声波速度降低, 即出现高声波时差响应; 在超压地层温度条件下, 高压液态水的电离常数可能明显增加, 从而减小地层电阻率, 进一步开展此种现象的相关探索性研究可望对超压带低电阻率异常的原因给出新的解释.
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| 关 键 词： | 超压(异常高压) 超压测井响应 超压成因 生烃增压 侏罗系 准噶尔盆地腹部 |
| 收稿时间： | 2008-10-21 |
Characteristics,Well-Log Responses and Mechanisms of Overpressures within the Jurassic Formation in the Central Part of Junggar Basin |
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| HE Sheng,HE Zhi-liang,YANG Zhi,WU Heng-zhi,WANG Fu-rong,SHI Wan-zhong,.Key Laboratory of Tectonics , Petroleum Resources of Ministry of Education,China University of Geosciences,Wuhan ,China .Faculty of Earth Resources,China .Research Institute of Petroleum Exploration , Production,SINOPEC,Beijing ,China .Southwest Branch Company,Chengdu ,China.Characteristics,Well-Log Responses and Mechanisms of Overpressures within the Jurassic Formation in the Central Part of Junggar Basin[J].Earth Science-Journal of China University of Geosciences,2009,34(3):457-470. |
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| Authors: | HE Sheng HE Zhi-liang YANG Zhi WU Heng-zhi WANG Fu-rong SHI Wan-zhong Key Laboratory of Tectonics Petroleum Resources of Ministry of Education China University of Geosciences Wuhan China Faculty of Earth Resources China Research Institute of Petroleum Exploration Production SINOPEC Beijing China Southwest Branch Company Chengdu China |
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| Institution: | HE Sheng1,2,HE Zhi-liang3,YANG Zhi2,WU Heng-zhi4,WANG Fu-rong2,SHI Wan-zhong1,21.Key Laboratory of Tectonics , Petroleum Resources of Ministry of Education,China University of Geosciences,Wuhan 430074,China 2.Faculty of Earth Resources,China 3.Research Institute of Petroleum Exploration , Production,SINOPEC,Beijing 100083,China 4.Southwest Branch Company,Chengdu 610051,China |
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| Abstract: | The deep overpressured system occurs in the Jurassic Formation of the central area of Junggar basin.This has been confirmed by drill stem tests(DSTs) and modular dynamic formation tests(MDTs) with 67 measured formation pressures from 26 wells which reveal excessive pressures ranging from 11 MPa to 57 MPa with the pressure coefficients of 1.24 to 2.07 at depths between 4 470 m and 6 160 m.The measured overpressured values are mostly in the sandstone layers of Jurassic formation,only a few in the bottom of th... |
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