四川盆地中西部地区雷口坡组三^3亚段储层特征及其分布  

Characteristics and distribution of reservoirs in the Lei-3^3 of the Leikoupo Formation in the western central Sichuan Basin

作　　者：辛勇光[1,2] 郑兴平[1,2] 周进高[1,2] 倪超 谷明峰[1,2] 宫清顺 彭辉界[3] 汪超[3] 

机构地区：[1]中国石油杭州地质研究院 [2]中国石油天然气集团公司碳酸盐岩储层重点实验室 [3]中国石油大学(北京)

出　　处：《天然气工业》2013年第3期5-9,共5页Natural Gas Industry

基　　金：国家科技重大专项"大型油气田及煤层气开发"(编号:2011ZX05004-002)

摘　　要：四川盆地中三叠统雷口坡组的产气层段主要为雷一1、雷三2亚段及雷四3亚段,近年来在盆地中西部地区雷三3亚段发现一套孔隙型白云岩储层,值得关注。为此,利用野外露头、岩心、测井等资料,结合分析化验结果,研究了雷三3亚段储层特征及其分布情况。结果表明:①雷三3亚段储集岩类以(含膏)泥粉晶白云岩及颗粒白云岩为主,晶间、粒间、粒内溶孔是其主要孔隙空间,海平面下降时期发生的萨布哈白云岩化作用和大气淡水溶蚀作用是孔隙形成的关键因素;②该套储层的发育和分布主要受海平面旋回和沉积相带控制,盆地西部、西北部台缘带储层最发育,中部台内浅滩及潮坪带储层较发育,中部台内洼地带储层不发育;③该套储层在盆地中西部地区广泛分布,并且在川中磨溪等地区油气显示较好,有可能成为雷口坡组新的产气层段。The major gas pay zones in the Middle Triassic Leikoupo Fm in the Sichuan Basin are Lei-1 （the 1^st member of the Leikou po Fm） , Lei 3^2 （the 2^nd interval of the 3^rd member of the Leikoupo Fm） and Lei 43 （the 3^rd interval of the 4th member of the Leikoupo Fm）. A set of dolomite reservoirs has been discovered in the Lei-33 （the 3^rd interval of the 3^rd member of the Leikoupo Fm） in the western central Sichuan Basin in recent years. Their characteristics and distribution were studied by use of outcrop observation, core and logging data in combination with laboratory test results. The following understandings were obtained, a. These reservoirs are dominated by （gypsum bearing） dolomicrite - silt-crystalline dolomite and grain dolomite, with inter-crystalline, inter-particle and in- tra particle dissolution pores as the major pore types. Sabkha dolomitization and meteoric fresh water dissolution are the main factors leading to the formation of pores, b. The development and distribution of these reservoirs are mainly controlled by eustatic cycles and sedimentary facies belts and are most highly developed on the platform margins in the western and northwestern parts, fairly devel- oped on the intra-platform shoal and tidal flat in the central part, and poorly developed in the intra-platform depressions, c. The res- ervoirs are so widely distributed in the western central Sichuan Basin and have such good oil/gas shows in the Moxi area of central Si- chuan Basin that thev might be the Dotential new gas pay zones in the Leikoupo Fm.

关 键 词：四川盆地 中西部 中三叠世 白云岩储集层 萨布哈白云岩化作用 大气淡水溶蚀作用 新的产气层段 

分 类 号：P618.13[天文地球—矿床学]