大庆石油地质与开发

2008, No.125(01) 34-38

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塔中地区T74界面碳酸盐岩古岩溶发育控制因素分析
Analysis on development controlling factor of carbonate rock ancient karst in T74 interface of central Tarim area

王黎栋,万力,于炳松
WANG Li-dong1,WAN Li1,YU Bing-song2(1.Water Resource and Environmental Academy

摘要(Abstract):

T47界面是塔中地区奥陶系重要的不整合界面,在其下的奥陶系碳酸盐岩风化壳中已获高产油气流。塔中地区石油勘探实践及T47界面形成时期地理地质条件的分析为塔中地区同期碳酸盐岩岩溶的广泛发育提供了充足的证据。以现代岩溶形成理论为指导,对发育于T47界面之下的碳酸盐岩体中的古岩溶研究表明,该区奥陶系碳酸盐岩古岩溶主要以发育于T47界面之下250~300 m的裂缝、孔洞为主的侵蚀面岩溶,垂向上具有良好的分带性,自上而下大致可以分为表生岩溶带、垂直渗流带、季节变化带、水平潜流带和深部缓流带;古岩溶的发育主要受古气候、岩性、构造、古地形及水文地质条件等因素的控制,其中岩性、古地形及古水文地质条件尤为关键;古岩溶高地南、北两侧的岩溶坡地坡度较缓地带,应是下一步石油勘探的重点区域。
T47 interface is a significant unconformity surface in Ordovician of central Tarim area,and high production airflow has existed in carbonate rock crust of weathering in the lower part of central Tarim area.Petroleum exploration practice in central Tarim area and analysis of geography and geology condition during the period of T47 interface formed provide enough evidence for wide development of carbonate rock karst with same period in the central Tarim area.On the basis of modern karst formed principle,study of ancient karst in carbonate rock under T47 interface indicates that,ancient karst in this area is a kind of erosion surface karst mainly developed in fracture of 250-300m and cavity under T47 interface,which vertically has better zonality,respectively from top to bottom,being epigenetic rock belt,vertical filtering flow belt,seasonal variation belt,level potential flow belt and deep sluggish flow belt.Furthermore,ancient karst is controlled by several factors including palaeoclimate,lithology,structure,palaeotopography and hydrologic geology,of which the last three are key factors.The next petroleum exploration key areas are located in slow slope gradient of karst sloping fields in the south and north sections of ancient karst highland.

关键词(KeyWords): 塔中地区;T47界面;碳酸盐岩;古岩溶;控制因素
central Tarim area;T47 interface;carbonate rock;ancient karst;controlling factor

Abstract:

Keywords:

基金项目(Foundation): 国家“973”项目(2005CB422103);; 中国石油集团公司重点项目联合资助

作者(Author): 王黎栋,万力,于炳松
WANG Li-dong1,WAN Li1,YU Bing-song2(1.Water Resource and Environmental Academy

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