川西新场地区须家河组二段砂体沉积充填特征及定量地质建模  

Sedimentary filling characteristics and quantitative geological modeling of sand bodies in Xu2 Member of Xujiahe Formation in Xinchang area,western Sichuan Basin

作　　者：商晓飞 赵磊[1] 易杰[2] 李蒙 刘君龙 SHANG Xiaofei;ZHAO Lei;YI Jie;LI Meng;LIU Junlong(Petroleum Exploration&Production Research Institute,SINOPEC,Beijing 100083,China;Northwest Branch of SINOPEC,Urumqi,Xinjiang 830011,China)

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中国石油化工股份有限公司西北油田分公司,新疆乌鲁木齐830011

出　　处：《中国海上油气》2022年第4期144-155,共12页China Offshore Oil and Gas

基　　金：中石化科技部项目“川西坳陷须家河组气藏描述与地质建模(编号:P18089-3)”部分研究成果。

摘　　要：基于岩心、测井和地震资料,开展了川西坳陷新场地区须家河组二段(须二段)砂体充填类型及其沉积展布规律研究,构建了该地区不同类型砂体的三维空间分布模型,为指导油气勘探开发提供定量化基础。新场地区须二段为辫状河三角洲沉积,主要有叠置河道、河道边缘、分流间湾和河口坝4种砂体沉积类型,其中叠置河道砂体厚度大、以中—粗粒沉积为主,是该区优质储层的主要发育区。新场地区须二段受龙门山和米仓山—大巴山两个方向的物源供给,下亚段新场西部的叠置河道更为发育,中亚段双物源供给较强,叠置河道砂体规模最大,上亚段叠置河道主要发育在新场地区东部。在地球物理预测的基础上,拟合变差函数并以地震砂厚趋势进行协同约束,首先建立砂泥岩地质模型,基于多级相建模思路,以不同类型砂体展布为训练图像,采用多点地质统计方法建立砂体类型空间分布模型。该模型实现了不同砂体类型在三维空间充填的定量描述,具有合理的各类砂体之间的接触关系,可以为后续相对优质砂体的定量刻画和开发方案优化提供保障。Based on the detailed description of cores,logging and seismic data,this paper analyzes the sand filling types and sedimentary distribution of the second member of Xujiahe Formation(Xu2 Member)in Xinchang area,western Sichuan Basin,and establishes a three-dimensional spatial distribution model of different types of sand bodies in this area,which provides a quantitative basis for guiding oil and gas exploration and development.The Xu2 Member in Xinchang area is of a braided river delta deposit,which is mainly composed of superimposed channel,channel edge,inter-distributary bay and mouth bar.The superimposed channel sand bodies are usually thick and mainly composed of medium-coarse grain deposits,constituting the main development area of high quality reservoirs in this area.The sediments of the Xu2 Member in Xinchang area were supplied by Longmen Mountain and Micang-Daba Mountains in two directions.The superimposed channels in the western part of Xinchang are better developed in the lower submember,while the superimposed channels in the upper submember are mainly developed in the eastern part of Xinchang.In the central submember sedimentary period,the dual source supply was strong,and the superimposed channel sand bodies are the largest in the whole study area.Based on the geophysical prediction,the variation functions are fitted and the seismic sand thickness trends are used as the constraints jointly,and the geological model of sand and mudstone is established.Taking the distribution of different types of sand bodies as training images,the spatial distribution model of sand body type is further established by multi-point geostatistics method based on the sand and mudstone model.This model realizes the quantitative description of sedimentary filling of different sand bodies in a 3 D space,and establishes more reasonable contact relationship between different sand bodies,which can provide guarantee for the quantitative characterization of relatively high-quality reservoirs and the optimization of oil and gas develo

关 键 词：砂体类型 砂体展布 地质建模 须家河组 新场地区 川西坳陷 

分 类 号：TE122.2[石油与天然气工程—油气勘探]