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作 者:金爱民[1,2] 尚长健[1,2,3] 朱蓉[1,2] 李梅[1,2] 楼章华[1,2]
机构地区:[1]浙江大学海洋科学与工程学系,浙江杭州310028 [2]浙江大学海洋研究中心,浙江杭州310058 [3]浙江大学地球科学系,浙江杭州310027
出 处:《中国矿业大学学报》2011年第5期758-765,共8页Journal of China University of Mining & Technology
基 金:全国油气资源战略选区调查与评价项目(XQ-2007-01);国家自然科学基金联合化工重点项目(40839902);国家科技重大专项(2008ZX05005-003-008HZ);"油气藏地质及开发工程"国家重点实验室项目(PLC201002);国家重点基础研究发展计划(973)项目(2005CB422107)
摘 要:水文地质条件是评价油气保存条件好坏的直接参数,从地下水化学-动力学角度对桂中坳陷及周缘油气保存条件进行了研究.结果表明:桂中坳陷及周缘自泥盆纪以来共经历了3个水文地质旋回,即海西期、印支期和燕山-喜山期;桂中坳陷及周缘在泥盆纪-早二叠世和晚二叠世-中三叠世阶段分别形成了2次主要的油气藏形成期,但燕山-喜山运动使得区内原已形成的油气藏几乎被破坏殆尽.多次构造运动和多期大气水下渗作用使得现今桂中坳陷内埋深小于800 m的浅部地层油气保存条件普遍差,地层水普遍为低矿化度水,800 m以下地层进入交替阻滞带,油气保存条件逐渐变好,推测交替停滞带在2 km以下;往坳陷外尤其是坳陷东部和东南部,大气水下渗深度更大.总体上,桂中坳陷中西部油气保存条件相对较好.Hydrogeological conditions are the direct parameters for the evaluation of preservation conditions of oil and gas.The petroleum preservation conditions in Guizhong depression and its margin are studied based on the analysis of groundwater hydrochemical and hydrodynamic characteristics.The results show that the Guizhong depression and its margin experienced three hydrogeological cycles as follows: Hercynian epoch,Indo Chinese epoch and Yanshan-Himalayan epoch.Devonian-Early Permian and Late Permian-middle Triassic are the two main periods of oil-gas reservoir formation,while these reservoirs were destroyed almost completely during the period of Yanshan-Himalayan movements.The hydrocarbon preservation conditions of shallow strata less than 800 m depth are generally poor due to the multiple tectonic movements and meteoric water infiltrations.This zone is of low mineralization formation water,and is named as free exchanging zone.The strata deeper than 800 m are regarded as exchanging-retarded zone,while exchanging-stagnant zone is below 2 km,in which the hydrocarbon preservation conditions are relatively good.The hydrocarbon preservation conditions are poor outside the depression especially the east and southeast areas due to the greater meteoric water infiltration depth.As a whole,hydrocarbon preservation conditions in the Midwest of Guizhong depression are relatively good.
分 类 号:P618.130.2[天文地球—矿床学] P532[天文地球—地质学]
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