陆相页岩气成藏条件分析——以松辽盆地南部S洼槽为例
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摘要
松辽盆地南部S洼槽营一段发育的泥页岩是页岩气成藏的有利地质条件。文中通过分析S洼槽陆相页岩气藏特点和勘探成果认为,营一段为半深—深湖亚相,发育大套黑色碳质泥页岩和灰黑色泥岩。泥页岩有机碳丰度高,平均1.16%;有机质类型丰富,为Ⅱ1型、Ⅱ2型和Ⅲ型;成熟度为0.75%～1.17%,处于成熟热演化阶段。泥页岩储层孔隙度平均为3.71%,有机质孔发育,纹层状泥页岩内水平缝发育。泥页岩埋藏适中,累计厚度大,泥地比高,具备页岩气成藏的保存条件。泥页岩段总含气量较高,平均2.3 mg/g。脆性矿物质量分数高,平均71.3%,具有较好的可压裂改造性。多口探井测试资料表明,该区营一段下部气测显示好,其中sj1,sj3等井区存在一定规模的页岩气资源,具有良好的资源前景和勘探潜力。
The favorable geological condition for shale gas accumulation is found in the S Depression of Songliao Basin. This paper analyzes the continental shale gas characteristics and exploration achievements of the S Depression. It is considered that the shale of Ying 1 Section is mostly developed in semi-deep lake and deep lake sedimentary facies belts and has a large set of black carbonaceous shale and gray-black mudstone. The shale has high abundance of organic carbon with an average value of 1.16%, and the organic type is rich in Ⅱ1, Ⅱ2 and Ⅲ. The maturity is 0.75% -1.17%, which is in the stage of mature thermal evolution. The average porosity of the shale reservoir is 3.71%, the organic pores are rich in the shale reservoir, and the horizontal seams are rich in the stratified mud shale. The shale is moderately buried, which has a large cumulative thickness and a high mud-to-earth ratio. It has the storage conditions for shale gas accumulation. The total gas content of the shale section is relatively high, with an average value of 2.3 mg/g. The content of brittle minerals is high, with an average value of 71.3 %, and it has good fissile reformability. The exploration well data of multiple drilling and testing show that the gas measurement in the lower part of the Ying 1 Section is good,and there are certain scales of shale gas resources in the well areas, such as Well sj1 and Well sj3, which have good resource prospects and exploration potential.
The favorable geological condition for shale gas accumulation is found in the S Depression of Songliao Basin. This paper analyzes the continental shale gas characteristics and exploration achievements of the S Depression. It is considered that the shale of Ying 1 Section is mostly developed in semi-deep lake and deep lake sedimentary facies belts and has a large set of black carbonaceous shale and gray-black mudstone. The shale has high abundance of organic carbon with an average value of 1.16%, and the organic type is rich in Ⅱ1, Ⅱ2 and Ⅲ. The maturity is 0.75% -1.17%, which is in the stage of mature thermal evolution. The average porosity of the shale reservoir is 3.71%, the organic pores are rich in the shale reservoir, and the horizontal seams are rich in the stratified mud shale. The shale is moderately buried, which has a large cumulative thickness and a high mud-to-earth ratio. It has the storage conditions for shale gas accumulation. The total gas content of the shale section is relatively high, with an average value of 2.3 mg/g. The content of brittle minerals is high, with an average value of 71.3 %, and it has good fissile reformability. The exploration well data of multiple drilling and testing show that the gas measurement in the lower part of the Ying 1 Section is good,and there are certain scales of shale gas resources in the well areas, such as Well sj1 and Well sj3, which have good resource prospects and exploration potential.
引文
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[19]王香增,高胜利,高潮.鄂尔多斯盆地南部中生界陆相页岩气地质特征[J].石油勘探与开发,2014,41(3):294-304.
[20]王伟峰,刘鹏,陈晨,等.页岩气成藏理论及资源评价方法[J].天然气地球科学,2013,24(3):429-438.
[2]周卓明,沈忠民,张玺,等.松辽盆地梨树断陷苏家屯次洼页岩气成藏条件分析[J].石油实验地质,2013,35(3):263-268.
[3]王金萍,黄泽贵,张云献,等.东濮凹陷优质烃源岩的岩性特征及宏观展布规律[J].断块油气田,2018,25(5):549-554.
[4]胡东风,张汉荣,倪楷,等.四川盆地东南缘海相页岩气保存条件及其主控因素[J].地质勘探,2014,34(6):17-23.
[5]王道富,高世葵,董大忠,等.中国页岩气资源勘探开发挑战初论[J].天然气工业,2013,33(1):8-17.
[6]刘大锰,李俊乾,李紫楠.我国页岩气富集成藏机理及其形成条件研究[J].煤炭科学技术,2013,41(9):66-74.
[7]罗鹏,吉利明.陆相页岩气储层特征与潜力评价[J].天然气地球科学,2013,24(5):1060-1068.
[8]邱小松,杨波,胡明毅.中扬子地区五峰组—龙马溪组页岩气储层及含气性特征[J].天然气地球科学,2013,33(2):1274-1283.
[9]王建国,李忠刚,顾岱鸿,等.考虑有机质含量的页岩吸附气含量计算模型及其应用[J].科学技术与工程,2014,14(22):28-33.
[10]邢祥,胡望水,吉林,等.基于等温吸附实验的页岩吸附气含量计算新方法[J].科学技术与工程,2013,13(16):4659-4662.
[11]谷宁,朱学谦,邢丽雯.非常规气储量计算方法分析[J].天然气与石油,2014,32(6):45-49.
[12]余涛,卢双舫,李俊乾,等.东营凹陷页岩油游离资源有利区预测[J].断块油气田,2018,25(1):16-21.
[13]曾伟凌,段新国,张磊,等.鄂尔多斯盆地合水地区延长组有机碳测井解释模型[J].四川地质学报,2016,36(2):320-322.
[14]郭凯.鄂尔多斯盆地陇东地区长7段有效烃源岩及生排烃研究[J].石油实验地质,2017,39(1):15-23.
[15]宋涛涛,毛小平.页岩气资源评价中含气量计算方法初探[J].中国矿业,2013,22(1):34-36.
[16]张作清,孙建孟,龚劲松,等.页岩气储层含气量计算模型[J].岩性油气藏,2015,27(6):5-14.
[17]陈祥,严永新,章新文,等.南襄盆地泌阳凹陷陆相页岩气形成条件研究[J].石油实验地质,2011,33(2):137-141.
[18]李延钧,冯媛媛,刘欢,等.四川盆地湖相页岩气地质特征与资源潜力[J].石油勘探与开发,2013,40(4):423-428.
[19]王香增,高胜利,高潮.鄂尔多斯盆地南部中生界陆相页岩气地质特征[J].石油勘探与开发,2014,41(3):294-304.
[20]王伟峰,刘鹏,陈晨,等.页岩气成藏理论及资源评价方法[J].天然气地球科学,2013,24(3):429-438.