川西上三叠统生物礁群分布特征及控制因素

川西上三叠统马鞍塘组的硅质海绵生物礁沿龙门山带出露， 前人已对其岩性、 化石、 分布及控制因素作了一定研究。将出露礁体的分布及岩性特征与欧洲硅质海绵礁对比， 进一步结合全球海绵—珊瑚礁的演化特征和川西地震剖面中似礁的丘形隆起现象， 认为川西地区在晚三叠世早期发育硅质海绵—珊瑚礁系列， 其中硅质海绵礁发育在较深水环境， 现今部分被后期龙门山冲断带推覆至地表； 含珊瑚的礁体发育在相对浅水、 高能环境， 现今位于川西凹陷中； 硅质海绵礁的展布范围受北面秦岭古陆的碎屑物注入影响， 沿龙门山方向向北逐渐变小； 高能礁体发育在川西拗陷至川中古隆起的过渡带上， 远离北面物源。对于揭示川西地区海相碳酸盐岩到碎屑岩的转变过程及马鞍塘组的油气勘探具有重要意义。

STUDY ON GEOLOGICAL 3D RESERVOIR ARCHITECTURE MODELING OF MEANDERING RESERVOIR AND ITS APPLICATION

Considering the meander river sand bodies at late high water cut stage which is under dense pattern,with the core,well logging and production data,the analysis hierarchy method is applies in subsurface architecture anatomy.According to this method,five architecture hierarchies including sedimentary units,sedimentary facies,single meandering belt,single point bar and lateral accretion bodies are identified and analyzed.Based on a large amount of modern deposition data and outcrop research,this paper introduces the relationship between width/thickness ratio of sand body and lateral accretion interlayer′s dip angel.Lateral accretion interlayer′s scale and model of river sand body are developed and the four parameters of lateral accretion interlayer including dip direction,dip angel,expanded range and horizontal range are described.Using sequential indicator simulation method and human computer exchange method,3D reservoir architecture model are established with Direct software.The method improve the efficiency of 3D architecture stochastic modeling of reservoir.According to different relations of 3D reservoir architecture model and injection production well patterns,three recovery measures for the remaining oil in lateral accretion shale bedding are proposed.Better measurement results are obtained.