四川盆地中部地区震旦系大型碳酸盐岩气藏开发技术新进展  

New technological progress in the development of Sinian large carbonate gas reservoirs in central Sichuan Basin

作　　者：闫海军[1] 杨长城[2] 郭建林[1] 刘曦翔 曹正林[1] 杨东凡[2] 王忠楠 邓惠[2,3] 张钰祥 杨山 季丽丹[1] 王丽珍[1] 夏钦禹 郑国强 YAN Haijun;YANG Changcheng;GUO Jianlin;LIU Xixiang;CAO Zhenglin;YANG Dongfan;WANG Zhongnan;DENG Hui;ZHANG Yuxiang;YANG Shan;JI Lidan;WANG Lizhen;XIA Qinyu;ZHENG Guoqiang(PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610051,China;Sichuan Petroleum Administration Co.,Ltd.,Chengdu,Sichuan 610051,China)

机构地区：[1]中国石油勘探开发研究院 [2]中国石油西南油气田公司 [3]四川石油管理局有限公司

出　　处：《天然气工业》2024年第5期68-79,共12页Natural Gas Industry

基　　金：中国石油天然气股份有限公司科技项目“老气田‘压舱石工程’关键技术研究与示范”(编号:2023YQX103);中国石油集团公司攻关性应用性科技专项“海相碳酸盐岩油气规模增储上产与勘探开发技术研究”(编号:2023ZZ16);四川省自然科学基金下项目“超高压特低孔强非均质碳酸盐岩气藏有效储层物性下限研究”(编号:2023NSFSC0261)。

摘　　要：四川盆地中部地区(以下简称川中地区)震旦系灯影组气藏为大型古老深层岩溶风化壳型碳酸盐岩气藏,气藏整体表现为低孔隙度低渗透率,储集空间小尺度缝洞发育,储层非均质性强特征,气藏开发面临储层表征难、井位部署和效益开发难度大等系列挑战。为此,以川中地区安岳气田灯影组气藏为对象,通过地质工程一体技术化攻关,深化了对储层发育特征和成因机理的认识,提出了气藏开发新模式,创建形成了气藏高效开发的关键技术。研究结果表明:①灯影组储层主要为岩溶成因储层,具有“叠合岩溶差异控储”的发育特征;②岩溶储层非均质性强,“溶蚀相成因控储”可精细刻画储层的非均质性;③灯影组气藏宜采用“单井指标叠加论证气藏规模”的开发新模式;④创新形成了“双界面”岩溶古地貌恢复及定量刻画方法,并指导平面选区,其中Ⅰ+Ⅱ类井比例由评价期的40%提高到方案建设期的100%;⑤创建了小尺度缝洞识别、刻画及表征技术,并指导钻井轨迹设计,测试百万立方米气井比例由开发评价期的41.6%提高到建产期的60%;⑥配套完善了分段酸压工艺技术,高效动用了优质储层,并解放了低品位储层,储层渗透率由改造前的0.62 mD提高到酸压改造后的6.77 mD。结论认为,“十四五”期间,在上述开发技术的支持下,安岳气田由台缘带灯四段高效开发转向长期稳产和台内地区多层系效益开发,蓬莱含气区由单井高产转向区块高产和气藏规模建产,将强力支撑中国石油西南油气田公司“十四五”末天然气上产500×10^(8)m^(3)。The gas reservoir of Sinian Dengying Formation in the central Sichuan Basin is a large-sized old deep karst weathering crust type carbonate gas reservoir,and it is overall characterized by low porosity,low permeability,developed small-scale fractures and vugs,and strong reservoir heterogeneity,which bring a series of challenges to its development in terms of reservoir characterization,well deployment and benefit development.Taking the Dengying Formation gas reservoir in the Anyue gas field as the research object,this paper further understands the reservoir development characteristics and formation mechanisms by means of geology-engineering integrated technological research.In addition,a new model of gas reservoir development is proposed,and the key technologies for efficient gas reservoir development are developed.And the following research results are obtained.First,the Dengying Formation reservoir is mainly of karst genesis,and presents the development characteristic of"differential control of superimposed karst on reservoirs".Second,karst reservoir has strong heterogeneity,which can be characterized precisely by means of the"dissolution facies genesis controlling reservoirs".Third,the new development model of"superposition of single well index to demonstrate the scale of gas reservoir"is suitable for the Dengying Formation gas reservoir.Fourth,the"dual-interface"karst paleogeomorphology restoration and quantitative characterization method is innovatively developed to guide the area selection on the plane,which increases the proportion of classⅠandⅡwells from 40%in the evaluation period to 100%in the construction period.Fifth,the small-scale fracture and vug identification and characterization technology is established to guide the drilling trajectory design,which increases the proportion of gas wells with tested production rate of one million cubic meters from 41.6%in the evaluation period to 60%in the construction period.Sixth,the staged acid fracturing technology is improved.As a result,high-quality rese

关 键 词：川中地区 安岳气田 蓬莱含气区 震旦系 小尺度缝洞 叠合岩溶 溶蚀相 双界面法 

分 类 号：TE323[石油与天然气工程—油气田开发工程]