川中QL地区沙溪庙组二段河道砂体精细刻画及含气性预测  

Fine characterization and gas-bearing property prediction of channel sand body of Sha 2 Member in Shaximiao Formation,QL area,central Sichuan

作　　者：袁永亮 蒋裕强[1] 邓海波 徐昌海 周亚东 潘辉 王占磊[1] 赵睿乾 UAN Yongliang;JIANG Yuqiang;DENG Haibo;XU Changhai;ZHOU Yadong;PAN Hui;WANG Zhanlei;ZHAO Ruiqian(School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China;Southwest Oil&Gas Field Company,PetroChina,Chengdu 610501,China;Research Institute of Exploration and Development,Southwest Oil&Gas Field Company,PetroChina,Chengdu 610041,China)

机构地区：[1]西南石油大学地球科学与技术学院,四川成都610500 [2]中国石油西南油气田公司,四川成都610501 [3]中国石油西南油气田分公司勘探开发研究院,四川成都610041

出　　处：《断块油气田》2025年第2期259-267,共9页Fault-Block Oil & Gas Field

基　　金：重庆市自然科学基金面上项目“基于成岩系统剖析的致密砂岩储层差异致密化机理及渗流差异响应研究”(No.cstc2021jcyj-msxmX0897)。

摘　　要：QL地区沙溪庙组二段发育多期河流相砂体,纵向上交错叠置,发育期次难以区分;河道砂体内部也具有较强的非均质性,河道砂体外形及河道内幕精细刻画的难度较大,这些制约了针对单河道为对象的开发目标评价。文中采用了先宏观后微观、先边界后内幕的思路:首先,根据井震精细标定,确定沙溪庙组二段砂体优质储层的地震反射特征,即顶强谷,底强峰;然后,以本征值相干属性为基础,结合数据体分频像素融合技术,对河道砂体边界进行准确界定;最后,以沉积相认识为基础,利用地层切片联合属性提取手段,刻画不同期次河道的空间展布特征及发育顺序,结合河道砂体地震响应特征,采用最大波谷、最小波阻抗等属性,在河道砂体边界的基础上,对河道内幕的变化进行表征。在河道刻画的基础之上,明确气层段的AVO响应特征,开展AVO属性反演,对储层含气性分布进行预测。该研究为四川盆地QL地区沙溪庙组致密河道砂体的增储建产提供了有利的支撑。The Sha 2 Member in QL area developed multi-stage fluvial sand bodies,which were staggered and overlapped vertically,and the development stages were difficult to distinguish.There is also strong heterogeneity inside the channel sand body,and it is difficult to finely characterize the shape of the channel sand body and the channel inside,which restricts the evaluation of the development target for a single channel.This research adopts the idea of macro first and then micro,boundary first and then inside.Firstly,the seismic reflection characteristics of the sandstone reservoir of Sha 2 Member are determined according to the fine well-seismic calibration,namely,strong wave through on the top and strong wave peak at the bottom.Then,based on the coherence attribute of eigenvalue and the pixel fusion technology of data volume frequency division,the boundary of channel sand body is accurately defined.Finally,based on the understanding of sedimentary facies,the spatial distribution characteristics and development sequence of channels in different periods are described by means of stratigraphic slice and attribute extraction.Combined with the seismic response characteristics of channel sand body,changes in channel interior are characterized based on the boundary of channel sand body by using attributes such as maximum wave through and minimum wave impedance.On the basis of the channel characterization,the AVO response characteristics of the gas interval are defined and the AVO attribute inversion is carried out to predict the gas bearing distribution of the reservoir.This study provides a favorable support for increasing reserve and production of the tight channel sand body in Shaximiao Formation,QL area,Sichuan Basin.

关 键 词：河道刻画 含气性预测 AVO属性反演 沙溪庙组 

分 类 号：TE132.1[石油与天然气工程—油气勘探]