贵州赤水地区中三叠统雷口坡组的成岩作用和储集性

赤水地区中三叠统雷口坡组的气藏是１９９１年初发现的，其储层主要发育在雷一＾１中段。储集岩主要为溶孔粉晶云岩，储集空间为晶间孔、晶间溶孔及溶孔。受沉积环境控制，成岩早期的淡水溶蚀作用是形成储集性的主要原因，导致雷一＾１亚段的储层具明显的成层性，而印支期抬升引起的风化淋滤作用进一步改善了储集性。成岩期的石膏充填则是使储集空间遭破坏的主要因素。本文通过“四性研究”，充分利用岩石学、岩石地球化学及各种微电

DIAGENESIS A AND RESERVOIR CHARACTERISTICS OF MIDDLE TRIASSIC LEIKOUPO FORMATON(Tr)DOLOMITE IN CHISHUI AREA, GUIZHOU

Middle Member is one of the important reservoir in Chishui area. The predominant lithofacies is crvstalline dolostone with dissolution voids,which belongs to testricted platform la-goon environment.Three types of pore space are identified in the reservoir dolomite:intercrys-talline pores,intercrystalling dissolution pores and other dissolution voids. Meteoric water dissolu-tion related to deposition environment dominates the establishment of reservoir capacity and re-sults to the layered reservoirs.The reservoir properties are futher improved by weathering and leaching caused by Indo-sinian lifting.The precipitation of diagenctic anhydrite detroyed subse-quently the porosity.Diagenetic sequence,reservoir characteristics and diagenetic effects on porosi-ty evolution are studied in this paper based on the data of petrology,petro-geochemistry,reservoir properties and log in information.