| 方解石脉对中扬子地区沉湖土地堂复向斜油气保存单元的指示意义 |
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| 引用本文： | 王芙蓉,何生,杨兴业.方解石脉对中扬子地区沉湖土地堂复向斜油气保存单元的指示意义[J].矿物岩石,2012,32(1):94-100. |
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| 作者姓名： | 王芙蓉 何生 杨兴业 |
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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;中国地质大学(武汉)资源学院,湖北武汉430074
2. 中国地质大学(武汉)资源学院,湖北武汉,430074 |
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| 基金项目： | 国家自然科学基金青年基金，国家自然科学基金重点项目，国家重大专项 |
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| 摘 要： | 野外观测表明,中扬子地区沉湖土地堂复向斜京山县城附近野外露头中二叠系和三叠系方解石脉主要是沿节理缝发育,脉体宽度较小。方解石脉的镜下微观的结晶特征、阴极发光特征、脉体穿插关系可以判断二叠系脉体大约有两期,三叠系脉体大约有三期。碳氧同位素值表明,三叠系方解石脉和围岩的氧同位素差值不大(Δδ18 O的差异范围为-0.19‰～4.12‰,平均值为1.9‰),二叠系方解石脉和围岩氧同位素差异较大(Δδ18 O的差异范围为4.07‰～12.03‰,平均值为7.3‰),三叠系脉体的流体直接来源于围岩,二叠系裂隙中方解石脉的形成过程中可能主要受到有机质的影响。方解石脉体中的流体包裹体均一温度在研究区建立的代表性虚拟井的埋藏史和热史基础上,推测二叠系方解石脉形成深度为3 000m～3 700m,形成深度约为2 000m～3 000m,两套地层中的方解石脉的形成时期为J3—K1燕山构造运动期。中扬子地区在多旋回的沉降和沉积过程中形成的上组合的区域性盖层(中三叠统—下侏罗统的泥质岩)在江汉平原区具有较好的封盖性。
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| 关 键 词： | 碳氧同位素 方解石脉 流体 油气保存单元 中扬子地区 |
INDICATION OF CALCITE VEIN CHARACTERISTICS ON PETROLEUM PRESERVATION IN THE CHENHUTUDITANG SYCLINORIUM,MIDDLE YANGTZE REGION, SOUTHERN CHINA |
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| WANG Fu-rong
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HE Sheng
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YANG Xing-ye.INDICATION OF CALCITE VEIN CHARACTERISTICS ON PETROLEUM PRESERVATION IN THE CHENHUTUDITANG SYCLINORIUM,MIDDLE YANGTZE REGION, SOUTHERN CHINA[J].Journal of Mineralogy and Petrology,2012,32(1):94-100. |
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| Authors: | WANG Fu-rong HE Sheng YANG Xing-ye |
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| Institution: | 1.Key Laboratory of Tectonics and Petroleum Resources(China University of Geosciences), Ministry of Education,Wuhan 430074,China; 2.Faculty of Earth Resources,China University of Geosciences,Wuhan 430074,China) |
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| Abstract: | Field observation shows that calcite veins in Permian and Triassic develop along joints and narrow band in Chenhutuditang syclinorium in the middle Yangtze region of Southern China.Study of thin sections,cathodeluminescence and interpenetration of calcite veins reveal that calcite veins develop in two periods in Permian and three periods in Triassic.Carbon-oxygen isotopes indicate that oxygen isotopic differentiation between calcite veins and surrounding rocks of Triassic range from-0.19‰ to 4.12‰ with an average of 1.9‰.However,differentiation in Permian is obvious,ranging from 4.07‰ to 12.03‰ with an average of 7.3‰.Carbon-oxygen isotopes suggest that the fluids resulting in calcite veins in Triassic derived from the surrounding rocks and calcite veins in Permian affected by organic matter.It is deduced that the calcite veins in Permian develop at the depth of 3 000 m～3 700 m and 2 000 m～3 000 m in Triassic during the period of Yanshan Movement.Regional cap rocks(mud rocks in middle Triassic to lower Jurassic) formed during multicycle subsidence and deposit processes in Ijanghan region are of favorable sealing effect. |
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| Keywords: | carbon-oxygen isotope calcite vein fluid petroleum preservation unite middle Yangtze region |
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