四川盆地中部蓬莱气区灯四段丘滩体优质储层特征及主控因素  

Characteristics and Main Controlling Factors of High-quality Reservoir in the Mound-beach Body of the Fourth Member of Dengying Formation in Gas Zones of the Central Sichuan Basin

作　　者：范毅 夏茂龙 贾松 李怡雯 陈泓位 王时林[2] 党亿佳 雷宝泽 Fan Yi;Xia Maolong;Jia Song;Li Yiwen;Chen Hongwei;Wang Shilin;Dang Yijia;Lei Baoze(PetroChina Southwest Oil&Gas Field Company,Chengdu,Sichuan 610041,China;Southwest Petroleum University,Chengdu,Sichuan 610041,China)

机构地区：[1]中国石油西南油气田公司,四川成都610041 [2]西南石油大学,四川成都610500

出　　处：《特种油气藏》2024年第5期1-10,共10页Special Oil & Gas Reservoirs

基　　金：中国石油重大专项“风险勘探领域和目标研究、工程技术攻关及现场试验”(2023YQX10104)。

摘　　要：为了明确蓬莱气区灯四段丘滩体优质储层发育特征及主控因素,通过钻井岩心、岩石薄片观察、测井及物性测试等资料,在储层岩性与孔渗物性分析的基础上,系统研究了优质储层发育主控因素,建立了储层沉积与形成模式。结果表明:灯四段优势储集岩性为藻凝块云岩、藻叠层云岩与藻纹层云岩,主要储集空间为溶蚀孔及微裂缝,溶蚀孔孔径向储层底部逐渐减小,发育基质孔隙型、溶孔型、溶蚀孔洞-微裂缝型3类储层。溶蚀孔洞-微裂缝型储层集中于灯四段上部发育,溶孔型储层主要在灯四段中上部发育,基质孔隙型储层集中于灯四段下部发育,储层整体具有低孔特低渗特点,垂向上丘基、丘核为优质储层发育层。桐湾期表生淡水溶蚀、埋藏热液溶蚀及烃运移有机酸溶蚀共同促进优势储层的发育,控制溶蚀作用强度与溶蚀模式;断裂可为渗流提供下渗运移的通道,沟通孤立孔隙,加速岩溶作用发育,控制岩溶作用强度与溶蚀孔洞空间展布。综合储集空间及纵向分布特点,从成因机制出发,建立了蓬莱气区灯四段表层混合岩溶体纵、横向叠加渗流缝溶体、水平潜流层溶体3类储集体发育模式。研究结果对蓬莱气区灯四段高效开发具有一定借鉴意义。In order to clarify the development characteristics and main controlling factors of high-quality reservoirs in the Fourth Member of Dengying Formation in Penglai gas zones,based on the analysis of reservoir lithology and porosity-permeability properties,the main controlling factors of high-quality reservoir development are systematically studied and the reservoir deposition and formation model are established by drilling core,rock slice observation,logging and physical property test.The results show that the dominant reservoir rocks of the Fourth Member of Dengying Formation are algae concretion dolomite,algae stromatolite,and algae laminated dolomite.The main reservoir space is formed by dissolution pores and microfractures.The diameter of dissolution pores decreases toward the bottom of the reservoir,and three types of reservoirs are developed:matrix pores,dissolution pores,and dissolution pore-microfractures.The dissolution pore-microfracture type is concentrated in the upper part of the Fourth Member of Dengying Formation;the dissolution pore type is mainly developed in the middle and upper part;the matrix pore type is concentrated in the lower part.The reservoir as a whole has the characteristics of low porosity and ultra-low permeability.Vertically,the mound base and mound core are developed as high-quality reservoir layers.Supergene freshwater dissolution,buried hydrothermal dissolution and hydrocarbon migration organic acid dissolution in Tongwanian jointly promote the development of dominant reservoirs and control the intensity and mode of dissolution.The fault can provide a channel for infiltration and migration of fluids,connect isolated pores,accelerate the development of karstification,and control the intensity of karstification and the spatial distribution of dissolution pores.Based on the characteristics of reservoir space and vertical distribution,starting from the genetic mechanism,three types of reservoir development models of vertical and horizontal superimposed seepage fracture solution and ho

关 键 词：藻白云岩 丘滩体 岩溶作用 发育模式 灯四段 蓬莱气区 

分 类 号：TE122[石油与天然气工程—油气勘探]