川西北厚坝地区上沙溪庙组沉积特征及油砂预测  

Sedimentary Characteristic and Oilsands Prediction in the Upper Shaximiao Formation,Houba Area,Northwestern Sichuan Basin

作　　者：杨雪飞[1,2] 王兴志[1,2] 张哨楠[1,2] 张博文 李浩 胡顺庆 钟赟 

机构地区：[1]西南石油大学油气藏地质与开发工程国家重点实验室,成都610500 [2]西南石油大学地球科学与技术学院,成都610500 [3]中海石油中国有限公司天津分公司勘探开发研究院,天津塘沽120107 [4]中国石油川庆钻探工程公司地质勘探开发研究院,成都610051 [5]中国石油川庆钻探工程公司川西钻探公司,成都610051

出　　处：《地质科技情报》2014年第3期112-117,共6页Geological Science and Technology Information

基　　金：四川省重点学科建设项目(SZD0414);西南石油大学研究生创新基金项目(GIFSS0711)

摘　　要：川西北厚坝油砂岩为我国典型的一类非常规石油资源,油砂主要发育在上沙溪庙组中下部的中-粗砂岩中。以层序地层学及沉积学相关理论为指导,通过野外观察、岩心描述、测井相分析、地震解释等手段对厚坝地区上沙溪庙组的沉积特征及油砂分布情况进行了研究。结果表明,上沙溪庙组发育低位体系域、水进体系域和高位体系域;该套地层发育的沉积相类型包括河流相、辫状河三角洲相和湖泊相;沙溪庙沉积期研究区西北部的龙门山古陆为物源区,碎屑向东南注入湖盆,在平面上,沉积相带从西北到东南依次为河流相、三角洲相、湖泊相。通过对野外露头以及单井沉积相研究发现油砂层主要发育在上沙溪庙组河道砂体中,孔渗性能较好,含油率较高,由此可知河道以及三角洲平原上的分支河道为有利沉积相。最后通过多口井的合成记录与地震剖面进行对比,从而标定并计算出油砂层的位置及厚度,绘制出油砂岩的厚度平面分布图,预测出上沙溪庙组油砂层的有利勘探区带。The Houba oilsand in the frontier of Longmen Mountains is an unconventional oil resource. Sedimentary features of the Upper Shaximiao Formation （J2s^2） and oilsand distribution in the Houba area has been analyzed through field observation, core analysis, logging and seismic explanation. Results show that the lower stand system tract, the transgressional system tract, and high stand system tract are preserved within the Shaximiao Formation. Sedimentary facies in J2s^2 can be divided into fluvial, braided river fandelta and lacustrine environments. The provenance from Longmenshan transported clasts from the northwest to the southeast into the lake basin. The sedimentary facies belt in the plain ranges from fluvial facies, delta facies, to lacustrine facies. The oilsand reservoir is mostly developed in the channel sand bodies with a high porosity and permeability, indicating that the watercourse and distributary channels in the delta are the favorable sedimentary facies for the development of oilsands. Comparing the synthetic seismograms of wells and seismic profiles, we demarcate and calculate the sand layers distribution and their thickness, and predict the most favorable exploration area for the Shaximiao oilsand.

关 键 词：油砂岩 上沙溪庙组 沉积相 油砂预测 厚坝地区 

分 类 号：P618.130.21[天文地球—矿床学]