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塔里木盆地西北缘奥陶系露头中的钙华特征及其石油地质意义
牛永斌1,2,钟建华1,王培俊1,陈鑫1,李佳1
(1.中国石油大学 地球资源与信息学院,山东 青岛 266555;2.河南省生物遗迹与成矿过程重点实验室,河南 焦作 454003)
摘要:
依据野外观测,利用岩石切片、薄片鉴定和孔隙度与渗透率测试等分析手段,对塔里木盆地西北缘巴楚五道班和柯坪硫磺沟两处奥陶系露头中钙华沉积进行研究,并应用地貌学和岩溶动力学对这些钙华成因进行分析。结果表明:这些钙华沉积具有较高的孔隙度和渗透率,可作为一种优质储层;巴楚五道班奥陶系钙华沉积成因为富含CO2的大气淡水溶蚀灰岩,在地下形成暗河,在暗河出口处的沼泽地带,由于压力下降,温度上升,造成岩溶水中CO2逸出,CaCO3大量沉淀形成钙华;柯坪硫磺沟奥陶系钙华沉积的成因为裂缝溶蚀扩大形成溶洞,然后由钙华沉积物分期沉淀而成。
关键词:  塔里木盆地  奥陶系  钙华沉积  碳酸盐岩  古岩溶
DOI:10.3969/j.issn.1673-5005.2010.04.005
分类号::TE 121.32
文献标识码:A
基金项目:国家油气重大专项课题(2008ZX05014-002-002HZ);河南省生物遗迹与成矿过程重点实验室开发基金项目(OTMP0903)
Tufa character and its oil gas significance of Ordovician outcrops in the northwest margin of Tarim Basin
NIU Yong bin1,2, ZHONG Jian hua1, WANG Pei jun1, CHEN Xin1, LI Jia1
(1. College of Geo Resources and Information in China University of Petroleum, Qingdao 266555,China;2.Key Laboratory of Biology Trace and Mining Process of Henan Province, Jiaozuo 454003,China)
Abstract:
By using methods of rock slice, thin section analysis and porosity and permeability testing, the tufa sedimentary characteristics were studied, and the origin of tufa were analyzed through the analysis of geomorphology and karst dynamics. The samples were collected from Ordovician outcrops in the fifth track of Bachu county and Keping sulfur gulch based on field observation. The results show that the tufa deposition is a good kind of reservoir with high porosity and permeability. The origin of tufa of Ordovician in the fifth track of Bachu county is that the fresh water which was rich in CO2 corroded limestone, then the underground river produced. When the karst water flowed out of the underground river, CO2 escaped and CaCO3 deposited largely in the marsh of epicontinental margin with the pressure declining and the temperature rising. The origin of tufa sedimentation of Ordovician in Keping sulfur gulch is that fracture corroded to enlarge into karat cave, then tufa formed as CaCO3 deposited by stage.
Key words:  Tarim Basin  Ordovician  tufa sedimentation  carbonate rock  karst
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