西湖凹陷深层低渗砂岩气藏高效开发关键技术及应用成效  

Key technologies for efficient development of deep low-permeability sandstone gas reservoirs and their application effectiveness in Xihu Sag

作　　者：黄导武 黄召 段冬平 伍锐东 李文俊 李炳颖 李艳飞 葛俊瑞 刘彬彬 陈晨 HUANG Daowu;HUANG Zhao;DUAN Dongping;WU Ruidong;LI Wenjun;LI Bingying;LI Yanfei;GE Junrui;LIU Binbin;CHEN Chen(CNOOC China Limited,Shanghai Branch,Shanghai 200335,China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《中国海上油气》2025年第1期103-115,共13页China Offshore Oil and Gas

基　　金：国家自然科学基金“东海深层低渗-致密气储层体系质量差异成因机制及演化模式(编号:U19B2006)”;中国海洋石油有限公司重大科技专项课题二“东海低渗大气田高效开发关键技术研究与示范应用(编号:KJZX-2024-0102)”部分研究成果。

摘　　要：随着海洋油气勘探开发的日益深入,深度大于3500 m的深层低渗气藏所占比例日益增加,海上少井条件下“甜点”储层成因与预测表征、适合海上高经济门槛的产能释放技术工艺等制约着低渗气藏高效开发。西湖凹陷深层大型低渗砂岩气田目的层为大型辫状河三角洲沉积体系,“甜点”物性演化受控于构造-沉积-成岩的三相耦合,沉积相带为主控因素,强水动力形成的高能心滩为“甜点”发育的有利相带;通过岩石物理分析、地震正演分析和叠前弹性反演等手段,形成了厚储层内部不同类型“甜点”预测的分级分类预测技术,采用基于样式的多点地质统计学相建模方法实现少井条件下模型精细表征;设计大斜度井/水平井/分支井穿越多期“甜点”以实现高产,“三层楼”式立体井网实现纵向非均质性气藏均衡动用;首次采用油基钻井液直接作为完井液,钻完井全过程均为油基工作液,储层保护效果好,实现表皮系数为零。研究成果实现了海上大型低渗气田少井高产高效开发,平均单井日产超过50万m^(3),极大扩展了海上深层低渗气田开发水平和界限,对中国近海以及国内外类似低渗油气田具有高的推广价值和应用前景。With the deepening of marine oil and gas exploration and development,the proportion of deep low-permeability gas reservoirs with depths greater than 3500 m is increasing.The cause and prediction of“sweet spot”reservoirs under the condition of few offshore wells,as well as the production capacity release technology suitable for offshore reservoirs with high economic thresholds,are restricting the efficient development of low-permeability gas reservoirs.The target layer of a large-scale low-permeability sandstone gas field in Xihu Sag is a large braided river-delta sedimentary system.The evolution of the“sweet spot”physical properties is controlled by the three-phase coupling of structure,sedimentation,and diagenesis,with sedimentary facies acting as the main controlling factor.The high-energy central bar formed bystrong hydrodynamics is a favorable facies for the development of the“sweet spot”.Through methods such as rockphysics analysis,seismic forward modeling,and prestack elastic inversion,the classification and prediction technology for different types of“sweet spot”in thick reservoirs is formed.A style-based multi-point geostatistical modeling method is used to achieve precise representation of the model under few well conditions.Highly inclined wells/horizontal wells/branch wells are designed to cross multiple“sweet spots”to achieve high production,and a“triple-decker”stereoscopic well pattern is used to achieve balanced utilization of vertically heterogeneous gas reservoirs.For the first time,oil-based drilling fluid is directly used as the completion fluid,and the entire drilling and completion process is carried out using oil-based working fluid.The reservoir protection effect is good,and the skin factor is zero.The research results have achieved high-yield and efficient development of large-scale low-permeability gas fields under the condition of few offshore wells,with average daily production exceeding 500000 cubic meters per well,greatly expanding the level and boundaries of de

关 键 词：低渗气藏开发 甜点成因 甜点预测 高效井型 油基泥浆完井 西湖凹陷 

分 类 号：TE37[石油与天然气工程—油气田开发工程]