综合多信息的高精度变差函数拟合优选分析:以塔中4东河砂岩油藏为例  

Optimization analysis of the high-precision variogram function fitting with multiple data:a case study of TZ4 Donghe sandstone reservoir

作　　者：尹楠鑫 江同文[2] 徐怀民[3] 徐朝晖[3] 罗超[1] 陈岑[1] YIN Nanxin;JIANG Tongwen;XU Huaimin;XU Zhaohui;LUO Chao;CHEN Cen(School of Petroleum and Natural Gas Engineering, Chongqing University of Science and Technology,Chongqing 401331,China;Tarim Oil Field Company,PetroChina,Korla 841000,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]重庆科技学院石油与天然气工程学院,重庆401331 [2]中国石油塔里木油田分公司,新疆库尔勒841000 [3]中国石油大学(北京)地球科学学院,北京102249

出　　处：《中国矿业》2018年第12期145-152,156,共9页China Mining Magazine

基　　金：国家自然科学基金项目资助(编号:51374269);重庆市教育委员会科学技术研究项目资助(编号:KJ1713346)

摘　　要：为解决在大井距油田地质建模过程中难以拟合高精度变差函数的问题,本文以塔中地区塔中4东河砂岩油藏为例,提出了综合利用直井、水平井和三维地震资料开展变差函数拟合的新思路。通过对地质变量不同方向、不同变差函数模型下的拟合结果对比优选发现,水平井资料具有丰富的横向信息,可拟合高精度的平面变差函数。拟合结果显示:样本数据相关性好,且无块金效应;对于钻井少,井信息相对较少的层位,利用地震数据求取变差函数平面分布图,进而开展不同方向变差函数分析,可优选出较为理想的变差函数曲线。因此,通过水平井和地震资料开展的变差函数研究结果,可解决大井距油田变差函数分析精度不够的问题,从而为建立精细三维地质模型提供可靠的地质统计参数。In 3D geological modeling of low well density oilfield,it is always difficult to match variogram flawlessly.This paper comprehensively uses data from vertical wells,horizontal wells and 3D seismic survey to create a new variogram matching method for Donghe sandstone in Tazhong area.By comparing variogram results of different orientation and different model,two conclusions are made.Horizontal wells have ample lateral information and could be used to match horizontal variogram which has high correlation rate and little nugget;seismic data can be used to analyze variograms of different orientations for oilfield which has few wells and the ideal variogram could be found.Based on horizontal well data and 3D seismic data,variogram of high matching degree could be calculated and reliable geological data for geological modeling is provided.

关 键 词：变差函数 水平井 三维地震数据 指数模型 球状模型 高斯模型 

分 类 号：TE319[石油与天然气工程—油气田开发工程]