桑植-石门复向斜及邻区古流体特征与油气保存意义

刘安; 危凯; 李旭兵; 王保忠; 王强

doi:10.11781/sysydz201506742

桑植-石门复向斜及邻区古流体特征与油气保存意义

doi: 10.11781/sysydz201506742

中国地质调查局武汉地质矿产研究所, 武汉 430205

基金项目: 中国地质调查局项目"武陵-湘鄂西页岩气资源调查评价"(12120114049801)、"桑植-石门及邻区油气地质综合调查研究"(1212011220745)资助。

详细信息

作者简介:
刘安(1981—),男,硕士,工程师,从事石油地质调查研究。E-mail:globstar@163.com

中图分类号: TE122.2
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出版历程
- 收稿日期: 2014-08-29
- 修回日期: 2015-09-08
- 刊出日期: 2015-11-28

Paleo-fluid characteristics and preservation of hydrocarbons in the Sangzhi-Shimen synclinorium and adjacent areas

Wuhan Institute of Geology and Mineral Resources, China Geology Survey, Wuhan, Hubei 430205, China

摘要

摘要: 通过对桑植-石门复向斜及相邻地区震旦系-三叠系方解石脉和围岩的碳氧同位素、锶同位素对比,结合方解石脉中流体包裹体测试分析,研究了桑植-石门地区古流体特征及其油气保存意义。下古生界围岩⁸⁷Sr/⁸⁶Sr部分高于同期海水,也高于方解石脉,表明围岩在裂隙形成之前受到高⁸⁷Sr/⁸⁶Sr流体改造。桑植-石门复向斜北翼温泉附近的方解石脉体具高⁸⁷Sr/⁸⁶Sr、低δ¹³C、低δ¹⁸O特征,显示大气水参与了方解石脉沉淀,逆断层可能在形成之初就不具封闭性。流体包裹体盐度和均一温度指示,桑植-石门地区上寒武统娄山关组上覆盖层残余厚度小于3 km,不具封闭能力;中寒武统孔王溪组方解石脉流体包裹体高盐度表明膏盐盖层在研究区广泛分布,在埋深超过2 km条件下对下伏地层具有较好的封盖能力。桑植-石门复向斜田二垭、向家垭、车坊背斜圈闭、桥头、中坪隐伏圈闭保存条件较好,除田二垭背斜外,可以同时将震旦系灯影组、寒武系清虚洞组白云岩作为勘探目的层。
- 古流体 /
- 同位素 /
- 流体包裹体 /
- 保存条件 /
- 桑植-石门复向斜 /
- 中扬子区
Abstract: The paleo-fluid characteristics and hydrocarbon preservation in the Sangzhi-Shimen synclinorium and adjacent areas are discussed using comparisons of C, O, and Sr isotopes between the calcite veins and surrounding rocks in the Sinian and Triassic formations and combined with the tests of fluid inclusions in calcite veins. The ⁸⁷Sr/⁸⁶Sr values of surrounding rocks in the Lower Paleozoic are higher than those of contemporary seawater and calcite veins, which suggests that the surrounding rocks had been reformed by fluid with high ⁸⁷Sr/⁸⁶Sr values before fracturing. The calcite veins close to thermal springs in the north of Sangzhi-Shimen synclinorium have high ⁸⁷Sr/⁸⁶Sr values, low δ¹³C and low δ¹⁸O values, which can be explained by the mixing of meteoric water during calcite vein deposition and suggests that reverse faults might have been open when they were formed. The salinity and homogenization temperature of fluid inclusions shows that the residual cap formations above the Upper Cambrian Loushanguan Formation are less than 3 km thick with poor sealing capacity. The high salinity of calcite inclusions in the Middle Cambrian Kongwangxi Formation showed that gypsum salt cap layers are distributed widely in the study area, and the gypsum salt layers buried over 2 km deep have excellent sealing capacity. The preservation conditions of the Tianerya, Xiangjiaya, Chefang anticline traps, and the Qiaotou, Zhongping buried structural traps are favorable. The dolomites in the Sinian Dengying Formation and Cambrian Qingxudong Formation are exploration targets except for those in the Tianerya anticline.
- paleo-fluids /
- isotopes /
- fluid inclusions /
- preservation conditions /
- Sangzhi-Shimen synclinorium /
- middle Yangtze region

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