四川磨溪—高石梯地区龙王庙组滩控岩溶型储集层特征及控制因素  

Characteristics and controlling factors of beach-controlled karst reservoirs in Cambrian Longwangmiao Formation, Moxi-Gaoshiti area, Sichuan Basin, NW China

作　　者：金民东[1,2,3] 曾伟[1,2,3] 谭秀成[1,2,3] 李凌[1,2,3] 李宗银[4] 罗冰[5] 张静蕾 刘吉伟[6] 

机构地区：[1]四川省天然气地质重点实验室 [2]中国石油碳酸盐岩储层重点实验室沉积与成藏分室 [3]西南石油大学 [4]中国石油西南油气田公司勘探事业部 [5]中国石油西南油气田公司勘探开发研究院 [6]中国石油西南油气田公司川中油气矿

出　　处：《石油勘探与开发》2014年第6期650-660,共11页Petroleum Exploration and Development

基　　金："十二五"国家科技攻关重大专项项目(2011ZX05004-005-03)

摘　　要：在四川盆地磨溪—高石梯地区龙王庙组钻孔、取心和室内分析测试资料基础上,研究其储集层特征、不同类型储集层成因和控制因素,并预测有利储集区带分布。岩心上,根据储集空间类型的差异和其与"花斑"状岩溶系统的发育组合特征,可将储集岩进一步划分为针孔、"花斑"针孔、溶洞及"花斑"溶洞等4种类型,其中"花斑"溶洞型储集层质量相对较好,其次为溶洞型和"花斑"针孔型,针孔型储集层质量相对较差。龙王庙组储集层的成因与控制因素表现为:区域浅滩化沉积作用形成了大面积颗粒云岩,以粒间孔和少量粒内溶孔为主要储集空间的滩相层状孔隙层为后期岩溶改造提供了物质基础,加里东期岩溶水沿先期孔渗层顺层流动溶蚀是优质储集层形成的关键。加里东—海西期龙王庙组构造古地貌控制了岩溶水流体势,进而控制了储集层发育。沿古地貌斜坡带(磨溪201井—磨溪9井—磨溪12井一带)岩溶最为发育,往往形成"花斑"溶洞型或溶洞型储集层,是最有利的储集区带。Based on data from boreholes, cores and lab analysis, the characteristics, genesis and controlling factors of different types of reservoirs in Cambrian Longwangmiao Formation, Moxi-Gaoshiti area, Sichuan Basin, are examined, and the distribution of favorable reservoir zones is predicted. The reservoirs can be subdivided into four types according to the different types of reservoir space and their combination with the ＂piebald＂ karst system： pinhole, ＂piebald＂ pinhole, cave, and ＂piebald＂ cave. Among them, the ＂piebald＂ cave reservoir is the best in quality, followed by the cave and ＂piebald＂ pinhole reservoirs, and the pinhole reservoir is the worst in quality. The genesis and controlling factors of Longwangmiao Formation reservoir are that the regional shoal deposition gave rise to a large area of grain dolomite, the layers with intergranular pores and small amount of intragranular dissolution pores of shoal facies provide a material base for later karst reformation. During the Caledonian period, the karst water flowing and corroding along the porous bed formed previously played a key role in the formation of premium reservoirs. During the period of the Caledonian-Hercynian, the tectonic paleogeomorphology controlled the fluid potential of karst water, which in turn decided the development of reservoirs. Karst is most developed on the slope of the paleotopography（along the well line of Moxi 201-Moxi 9-Moxi 12）, where ＂piebald＂ cave or cave reservoirs usually occur, which are the most favorable reservoir zones.

关 键 词：颗粒云岩 储集层特征 储集层成因 “花斑”状岩溶系统 龙王庙组 四川盆地 磨溪—高石梯地区 

分 类 号：TE122.1[石油与天然气工程—油气勘探]