河包场地区须家河组储层有利区带预测
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摘要
四川盆地河包场地区上三叠统须家河组储层非均质性强、气水关系复杂,进行高分辨率层序地层划分,预测砂岩储层发育的主力层系与有利区带,对于天然气的勘探开发部署具有重要意义。利用露头、岩心、测井、地震等多种资料,建立层序地层格架,将该区须家河组划分为4个三级层序、11个四级层序,每个四级层序又可细分为7～10个五级层序。研究结果表明:①主力气层发育于sq21(须家河组二段上亚段)、sq23(须家河组四段下亚段);②聚气相带为水下分流河道与河口坝;③对重点四级、五级层序进行了储层精细刻画,综合考虑储能系数、沉积微相、试气资料及所处构造位置等因素,评价出14个Ⅰ类、Ⅱ类储层有利区带。其中Ⅰ类储层有利区带包括:包22—包24—包浅4井区、包21—包1—包浅001-6井区、包33—包16—包45井区、包浅208井区、包27—包浅205井区、包浅4、包浅001-6、包206井区、包39井区。
Sandstone reservoirs of the Xujiahe Formation in Hebaochang area,the Sichuan Basin,are strong in heterogeneity and complicated in gas-water contact,so high-resolution sequence stratigraphic division and the prediction of the major horizons and potential plays with well-developed sandstone reservoirs are of great significance to the planning of gas exploration and development in the area.A sequence stratigraphic framework was established through integrated analyses of outcrops,cores,log and seismic data.The Xujiahe Formation was divided into 4 third-order sequences and 11 fourth-order sequences,each of which was subdivided into 7 to 10 fifth-order sequences respectively.The following results were obtained.①The major gas reservoirs occur in the upper interval of the second member of the Xujiahe Formation(sq21)and the lower interval of the fourth member of the Xujiahe Formation(sq23).②Underwater distributary channel and mouth bar are the favorable facies tracts for gas accumulation.③ Reservoirs in the key fourth-order and fifth-order sequences are described in detail,and 14 type-I and type-II potential plays are identified based on a comprehensive appraisement of the storage factors,depositional microfacies,well test data and structural background.
Sandstone reservoirs of the Xujiahe Formation in Hebaochang area,the Sichuan Basin,are strong in heterogeneity and complicated in gas-water contact,so high-resolution sequence stratigraphic division and the prediction of the major horizons and potential plays with well-developed sandstone reservoirs are of great significance to the planning of gas exploration and development in the area.A sequence stratigraphic framework was established through integrated analyses of outcrops,cores,log and seismic data.The Xujiahe Formation was divided into 4 third-order sequences and 11 fourth-order sequences,each of which was subdivided into 7 to 10 fifth-order sequences respectively.The following results were obtained.①The major gas reservoirs occur in the upper interval of the second member of the Xujiahe Formation(sq21)and the lower interval of the fourth member of the Xujiahe Formation(sq23).②Underwater distributary channel and mouth bar are the favorable facies tracts for gas accumulation.③ Reservoirs in the key fourth-order and fifth-order sequences are described in detail,and 14 type-I and type-II potential plays are identified based on a comprehensive appraisement of the storage factors,depositional microfacies,well test data and structural background.
引文
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[2]田继军,姜在兴,李熙喆,等.川西前陆盆地上三叠统层序地层学研究[J].天然气工业,2008,28(2):30-33.
[3]胡晓强,陈洪德,纪相田,等.川西前陆盆地侏罗系层序地层[J].西南石油学院学报,2006,28(2):16-19.
[4]高志勇,罗平,郑荣才,等.四川磨溪—龙女寺构造香溪群高分辨率层序地层分析[J].成都理工大学学报,2005,32(6):57-63.
[5]谢武仁,李熙喆,张满郎,等.川中地区上三叠统须四段厚层砂体成因及油气运移通道分析[J].石油学报,2008,29(4):54-58.
[6]田继军,姜在兴,李熙喆,等.川中上三叠统须二段厚层砂岩的成因及其对储层、气藏的控制[J].大庆石油地质与开发,2008,27(2):34-37.
[7]李熙喆,张满郎,谢武仁.川西南地区上三叠统须家河组沉积相特征[J].天然气工业,2008,28(2):54-57.
[8]周跃宗,雷卞军,赵永刚,等.川中—川南过渡带嘉二段成岩作用及其储层发育[J].西南石油学院学报,2006,28(2):11-16.
[9]高阳,蒋裕强,缪灏,等.河包场地区上三叠统须家河组储层下限研究[J].西部探矿工程,2008,12(5):59-62.
[10]张庄,曾伟,杨西燕.蜀南地区上三叠统须家河组成岩相划分[J].西南石油学院学报,2006,28(6):13-15.
[11]魏小薇,谢继容,唐大海,等.低孔渗砂岩储层基质物性下限确定方法研究——以川中LA构造沙一段油藏为例[J].天然气工业,2005,25(增刊A):82-85.
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