【摘要】 研究现代岩溶地下河内大型缝洞空间的形成机理,可成为揭示古岩溶缝洞体储层发育的"钥匙",并指导油气勘探。根据对桂林寨底地下河系统的野外地质调查、示踪试验、物探及钻孔资料研究,基本确定了寨底地下河系统内大型岩溶缝洞发育的展布特征。认为地貌、水系、岩性、断裂等是寨底地下河管道发育的主控因素。结合三维地震技术,对塔里木盆地北部哈拉哈塘某井区晚奥陶世岩溶期岩溶进行了地质背景、古地貌、古水系及古水动力条件分析,刻画了哈拉哈塘晚奥陶世岩溶期的一条古岩溶地下河及其大型缝洞储集空间的分布。勘探结果表明在地下河管道上的钻井均获得高产。更多还原

【Abstract】 The research to the formation mechanisms of modern karst subterranean streams can be a "key" to reveal the genesis of space distribution of reservoirs full of large paleokarstic fractures and caves, which is useful to guide oil and gas exploration. There is an underground river at Zhaidi in Guilin, Guangxi province. Based on studies of field geological survey, tracer tests, geophysical and drilling data, it has been clear how the large karstic fracture-cave space distributes within the underground network of Zhaidi River with total 10.6km length of subterranean stream pipelines. It is proved that geomorphology, stream network, lithology and faults are the factors affecting development of the underground river network. In light of the research of Zhaidi Underground River, the case is applied to analysis of a paleokarst underground river that distributes within Ordovician karst fractured-caved reservoirs in Halahatang Field,Northern Tarim Basin. The network of the paleokarst underground river and the space distribution of large karstic fracture-cave system in it are depicted according to the comprehensive analysis of karst geological background, the palaeogeomorphology, ancient water system, and ancient hydrodynamic conditions, combined with 3-D seismic technology. Exploration result has indicated the fact that economical productions are obtained in all of wells drilled in the underground river pipelines.更多还原