川中地区须家河组二段优质储层分布特征  

RESERVOIR DISTRIBUTION OF XUJIAHE 2 MEMBER, CENTRAL SICHUAN BASIN

作　　者：王小娟[1] 谢继容[2] 唐大海[1] 李国辉[1] 

机构地区：[1]中国石油西南油气田公司勘探开发研究院 [2]中国石油西南油气田公司川西北气矿

出　　处：《天然气勘探与开发》2015年第3期1-6,共6页Natural Gas Exploration and Development

基　　金：国家重大科技项目(2011ZX05001-005)"四川盆地岩性油气藏富集规律与目标评价"

摘　　要：上三叠统须家河组二段是四川盆地重点勘探层系之一。通过200余口井资料分析,对比了不同类型砂体储集性能后认为:优质储层岩石类型为浅灰色中—细粒长石岩屑砂岩,孔隙类型为粒间孔和粒内溶孔,主要发育绿泥石胶结,具有低电阻、低伽玛、高声波的"二低一高"电性特征;沉积相和成岩相控制了优质储层的发育,水下分流主河道微相是优质储层形成的关键,绿泥石胶结有利于原生孔隙的保存。结合测井和地震储层预测,明确了川中地区须二段优质储层为大面积叠置连片分布,指出了有利勘探区带。成果对川中地区须家河组二段勘探整体部署有重要意义。Xujiahe 2 Member of Upper Triassic is one of the most important exploration layers in Sichuan Basin. Some data from over 200 wells were analyzed, and reservoir properties of various sandbody were also studied. Results show that(1)the high-quality reservoirs are composed of light grey medium-to fine-grained feldspar lithic sandstone;(2)their porous types contain intergranular pore and intragranular dissolution pore in which mainly are developed by chlorite cements;(3)these sandstone reservoirs appear a feature of two lows and one high, such as low resistivity and gammy-ray value, and high acoustic-wave velocity;(4)the reservoir development is affected by sedimentary facies and diagenetic facies;(5)underwater distributary channel subfacies is the key to form the high-quality reservoirs;and(6)chlorite cements are conducive to primarypore preservation. In addition, that in central Sichuan Basin, the Xujiahe 2 reservoir with high quality appear a large-scale and sheet-shaped distribution is made clear based on well-logging and seismic data. At last, some favorable belts are presented. All results are significant to an overall exploration deployment for Xujiahe 2 Member in central Sichuan Basin.

关 键 词：四川盆地 须家河组 须二段 优质储层 

分 类 号：P618.13[天文地球—矿床学]