川东北礁滩天然气勘探新进展及关键技术
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摘要
川东北地区位于四川盆地东北部,是中国石化勘探南方分公司天然气勘探的主战场。该区地表地形复杂,二叠系、三叠系目的层埋藏深(5 500～7 500m),储层受沉积相带控制,识别难度大,经历多期构造演化且各区块差异大,给油气勘探带来极大的困难。近年来,该公司在已有成果认识的基础上,通过深化二叠系、三叠系台缘礁滩相油气地质综合研究及勘探技术攻关,进一步明确了台缘礁滩相储层发育特征和油气成藏富集规律;形成了独具特色的"相控三步法"礁滩储层有效预测技术和深部高精度三维地震采集处理一体化及复杂超深井钻井等先进适用配套技术,使得礁滩相勘探目标不断拓宽;探明了普光气田,新近发现了元坝气田,还取得了涪陵北部高陡复杂构造区复向斜部位礁滩相勘探突破,实现了天然气储量的快速增长。
The northeastern Sichuan Basin is the major area of gas exploration for the Sinopec South Exploration Company.Gas exploration in this area is challenged by complex surface conditions,large burial depths of the Permian and Triassic targets(5500-7500 m),control of sedimentary facies belt on reservoirs,multistage tectonic movements,and large differences between blocks.In recent years,based on comprehensive geologic research,a deep understanding is achieved of the development characteristics of the Permian and Triassic reservoirs of platform margin reef-bank facies and their patterns of hydrocarbon accumulation.A series of advanced and practical techniques are developed to widen the exploration domains,including the effective method of "three-step seismic facies-controlled prediction" of reef-bank reservoirs,integrated deep 3D seismic acquisition and processing with high resolution,and drilling of deep and complex wells.As a result,the Puguang and Yuanba gas fields are successively discovered,and a breakthrough is also made in the exploration of reef-bank reservoirs in the complex steep structural zone in the northern Fuling area.All these contribute to a rapid growth of gas reserves for this company.
The northeastern Sichuan Basin is the major area of gas exploration for the Sinopec South Exploration Company.Gas exploration in this area is challenged by complex surface conditions,large burial depths of the Permian and Triassic targets(5500-7500 m),control of sedimentary facies belt on reservoirs,multistage tectonic movements,and large differences between blocks.In recent years,based on comprehensive geologic research,a deep understanding is achieved of the development characteristics of the Permian and Triassic reservoirs of platform margin reef-bank facies and their patterns of hydrocarbon accumulation.A series of advanced and practical techniques are developed to widen the exploration domains,including the effective method of "three-step seismic facies-controlled prediction" of reef-bank reservoirs,integrated deep 3D seismic acquisition and processing with high resolution,and drilling of deep and complex wells.As a result,the Puguang and Yuanba gas fields are successively discovered,and a breakthrough is also made in the exploration of reef-bank reservoirs in the complex steep structural zone in the northern Fuling area.All these contribute to a rapid growth of gas reserves for this company.
引文
[1]马永生.四川盆地普光超大型气田的形成机制[J].石油学报,2007,28(2):9-14.
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[4]郭旭升,郭彤楼,黄仁春,等.普光—元坝大型气田储层发育特征与预测技术[J].中国工程科学,2010,12(10):82-90.
[5]胡东风.川东北元坝地区隐蔽气藏的勘探突破及其意义[J].天然气工业,2010,30(8):9-12.
[2]马永生,牟传龙,郭彤楼,等.四川盆地东北部长兴组层序地层与储层分布[J].地学前缘,2005,25(4):73-79.
[3]马永生,牟传龙,郭旭升,等.四川盆地东北部长兴期沉积特征与沉积格局[J].地质论评,2006,52(1):25-29.
[4]郭旭升,郭彤楼,黄仁春,等.普光—元坝大型气田储层发育特征与预测技术[J].中国工程科学,2010,12(10):82-90.
[5]胡东风.川东北元坝地区隐蔽气藏的勘探突破及其意义[J].天然气工业,2010,30(8):9-12.
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