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四川盆地下寒武统沧浪铺组岩相古地理特征及对储层发育的控制作用
Lithofacies paleogeography features of the Lower Cambrian Canglangpu Formation in Sichuan Basin and their control on reservoir development
严 威 钟 原 周 刚 陈友莲 和 源 王文之 李亚丁 陈 曦 郗 诚
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作者单位:中国石油西南油气田公司勘探开发研究院
中文关键字:四川盆地 寒武纪 沧浪铺组 岩相古地理 储层特征 主控因素
英文关键字:Sichuan Basin; Cambrian; Canglangpu Formation; Lithofacies palaeogeography; Reservoir characteristics; Main controlling factor.
中文摘要:    风险探井JT1 井在兼探下寒武统沧浪铺组过程中钻遇了孔隙型气层14.5 m, 并在近期测试获得日产天然气51.62×104 m3 的高产工业气流, 标志着四川盆地沧浪铺组油气勘探首次战略突破, 揭示出川中古隆起北斜坡沧浪铺组具有巨大的勘探潜力。前期对震旦系—下古生界的勘探主要集中在四川盆地中部地区上震旦统灯影组及下寒武统龙王庙组, 围绕沧浪铺组尚未进行系统研究工作, 这直接制约了该层系的勘探突破和发现。为此, 基于现有的钻测井、露头、地震等资料, 结合大地构造背景, 重建四川盆地下寒武统沧浪铺组岩相古地理, 分析储层特征并预测川中北部地区储层发育区, 最终探讨岩相古地理对储层发育的控制作用,以期为盆地沧浪铺组勘探提供理论支撑。结果表明:①根据岩性组合特征可将沧浪铺组划分为碳酸盐岩较为发育的沧一段及以碎屑岩沉积为主的沧二段;②沧一段沉积期德阳—安岳裂陷槽已演变为棚内洼地, 以其为界形成“西浊东清”的沉积格局, 沧二段沉积期盆地周缘陆源物质进一步向盆地内输入, 碳酸盐岩沉积相带向东迁移, 盆地内演化为大面积的混积浅水陆棚环境;③储层主要发育在沧一段白云岩中, 储集空间包括粒内溶孔、粒间溶孔、晶间溶孔、晶间孔等;④建立了优质储层地震响应模式, 于川中北部射洪—公山庙地区预测出9 个大型滩相储层发育区, 合计面积达5 600 km2 ;⑤岩相古地理条件及古岩溶改造是沧浪铺组储层形成的两个最主要的控制因素。白云石化的颗粒滩为储层形成提供了物质基础, 加里东末期古岩溶使早期滩体储集能力得到进一步改善。
英文摘要:    During the exploration of the Lower Cambrian Canglangpu Formation, JT1 well, a risk exploration well, encountered some porous gas layers with 14.5 in thickness. And high-yield industrial gas flow with 51.62×104 m3/d has been recently achieved after testing, making the first strategic breakthrough in oil and gas exploration of Canglangpu Formation in Sichuan Basin, which revealed that this formation in the north slope of central basin has great exploration potential. In the early stage, the exploration of the Sinian to Lower Paleozoic mainly concentrated in the Upper Sinian Dengying Formation and the Lower Cambrian Longwangmiao Formation in central basin, but systematic research on Canglangpu Formation has not been carried out, which might directly restrict its exploration breakthrough and discovery. Therefore, based on drilling, well logging, outcrop, and seismic data, the lithofacies paleogeography of the Lower Cambrian Canglangpu Formation in Sichuan Basin was reconstructed by combining with geotectonic background, the reservoir characteristics were analyzed, and the reservoir development area in the north of central basin was predicted. Finally, the effect of lithofacies paleogeography on reservoir development was discussed, so as to provide theoretical support for the exploration of Canglangpu Formation. Results show that (1) according to some characteristics of lithologic association, Canglangpu Formation can be divided into Canglangpu 1 and Canglangpu 2 members mainly developed with carbonate rocks and clastic rocks, respectively;(2) during the deposition of Canglangpu 1 Member, Deyang—Anyue rift trough had evolved into a intra-shelf depression, forming one sedimentary pattern of "turbid flow deposited in the west and clear water flow deposited in the east" with the rift trough as the boundary. Whereas during the deposition of Canglangpu 2 Member, terrigenous materials from basin periphery were further importedinto the basin, a carbonate sedimentary-facies belt migrated to the east, and the basin evolved into massive diamictic shallow-water shelf environment; (3) most reservoirs are mainly developed in the dolomite of Canglangpu 1 Member, and their space includes intragranular dissolved pore, intergranular dissolved pore, and intercrystalline dissolved pore; (4) a seismic response model has been established for high-quality reservoirs, and one belt developed with nine large shoal reservoir is predicted in Shehong—Gongshanmiao area in north part of central Sichuan, with a total area of 5 600 km2; and (5) both lithofacies paleogeography condition and paleokarst reformation are the two main controlling factors to form Canglangpu reservoirs, dolomitized granular shoal provides material basis
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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