塔巴庙地区奥陶系风化壳马五5亚段储层特征

对塔巴庙地区50余口探井的岩石学和古岩溶学及电性、物性特征进行分析、研究，发现奥陶系风化壳马五⁵黑灰岩段在成岩晚期发生粉晶白云岩化作用形成白云岩储层，其成因是与煤系地层油气形成有关的酸性热水深埋环境的产物；其电性具有三低一高特点：即低阻、低Pe、低电位和高时差；其物性具有较高孔隙度和渗透率，储集条件明显变好。研究表明马五5白云岩化储层分布在研究区北部以及与岩溶高地相关的区域，目前该区已有多口探井获得工业气流。

RESERVOIR CHARACTERISTICS OF M55 MEMBER OF ORDOVICIAN WEATHERING CRUST IN TABAMIAO AREA

The lithology, palaeo-carst, electrical property and physical property over fifty exploratory wells in Tabamaiao area are analyzed in order to provide new natural gas exploring targets. It is discovered that Ma 5 black limestone member of Ordovician weathering crust formed dolostone reservoir owing to the fine crystal dolomitisation happened in late diagenetic period. The origin is the result of deep burying of acid hot water relating to petroleum formation of coal strata. The electrical property is of the characteristics low resistivity, low Pe, low spontaneous potential and high acoustic in well logs. The physical property is of high porosity and permeability, and the reservoir conditions are obviously favorable. The research result shows that the M5 member dolomized reservoir distributes in the northern part of the studied area and the region correlated with paleo-karst highland. Commercial gas flows are obtained in many exploratory wells at present.