Oil & Gas Geology ›› 2023, Vol. 44 ›› Issue (1): 1-15.doi: 10.11743/ogg20230101
• Petroleum Geology • Previous Articles Next Articles
Caineng ZOU1,2(), Zengye XIE1,2(), Jian LI1,2, Lu ZHANG1,2, Chunlong YANG1,2, Huiying CUI1,2, Xiaobo WANG1,2, Zeqing GUO1,2, Songqi PAN1,2
Received:
2022-05-30
Revised:
2022-11-16
Online:
2023-01-14
Published:
2023-01-13
Contact:
Zengye XIE
E-mail:zcn@petrochina.com.cn;xiezengye69@ petrochina.com.cn
CLC Number:
Caineng ZOU, Zengye XIE, Jian LI, Lu ZHANG, Chunlong YANG, Huiying CUI, Xiaobo WANG, Zeqing GUO, Songqi PAN. Differences and main controlling factors of large-scale gas accumulations in typical giant carbonate gas fields: A case study on Anyue gas field in the Sichuan Basin and Jingbian gas field in the Ordos Basin[J]. Oil & Gas Geology, 2023, 44(1): 1-15.
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Table 1
Statistics of basic parameters of Anyue and Jingbian gas fields"
气田 | 安岳气田 | 靖边气田 | |
---|---|---|---|
气田地理位置 | 四川省和重庆市境内 | 陕西省和内蒙古自治区境内 | |
区域构造位置 | 川中古隆中斜平缓构造带 | 鄂尔多斯盆地陕北斜坡中部 | |
发现井(年份) | GS1井(2011)和MX8井(2012) | SC1井和YU3井(1989) | |
发现井测试产量 | GS1井灯二段天然气102×104 m3/d; MX8井龙王庙组天然气190×104 m3/d | SC1井奥陶系天然气5.984×104 m3/d; YU3井奥陶系天然气6.800×104 m3/d | |
气藏特征 | 储量 | 探明1.04×1012 m3;可采0.68×1012 m3 | 探明0.90×1012 m3;可采0.54×1012 m3 |
含气面积 | 2 725 km2 | 11 715 km2 | |
产层埋深 | 龙王庙组4 500~4 700 m;灯影组5 050~5 500 m | 2 900~3 900 m | |
压力系数 | 寒武系1.53~1.67;震旦系1.11~1.14 | 0.78~1.00 | |
气藏温度 | 龙王庙组140~145 ℃;灯影组150~170 ℃ | 93~128 ℃ | |
含气饱和度 | 71.3%~82.3 %,平均77.5 % | 65.0 %~80.0 %,平均72.6 % | |
圈闭类型 | 构造、构造-地层、岩性-地层、构造-岩性、岩性圈闭 | 地层-岩性、岩性-地层、构造-岩性、岩性圈闭 | |
流体性质 | 干气 | 干气 | |
烃源岩 | 下寒武统筇竹寺组页岩;震旦系(灯三段、陡山沱组)页岩;灯影组碳酸盐岩 | 上古生界石炭系-二叠系煤系烃源岩;下古生界奥陶系海相碳酸盐岩烃源岩 | |
储层 | 沉积相带 | 台缘带丘滩、台内颗粒滩 | 蒸发台地的含膏云坪、膏云坪;台缘鲕粒滩、台内鲕粒滩 |
层位 | 寒武系龙王庙组、震旦系灯影组 | 奥陶系马家沟组 | |
主力产层 | 龙王庙组、灯影组四段 | 马五1、马五2、马五4亚段 | |
主要岩性 | 龙王庙组为颗粒(砂屑、鲕粒)白云岩和晶粒(细晶、粉晶)白云岩;灯四段为藻凝块白云岩、藻叠层白云岩、藻纹层白云岩和砂屑白云岩;灯二段为藻砂屑白云岩、藻凝块白云岩和藻叠层白云岩 | (含)膏模孔细-粉晶云岩和粉晶云岩;微生物白云岩、斑状粉晶白云岩和斑状灰质白云岩 | |
有效厚度 | 龙王庙组12.6~36.4 m;灯影组23.6~45.1 m | 2.6~8.1 m | |
有效孔隙度 | 龙王庙组3.4 %~4.8 %;灯影组3.2 %~3.8 % | 4 %~9 % | |
储集空间 | 中-小型溶洞、粒内溶孔、粒间溶孔、晶间溶孔、残余粒间孔 | 膏模孔、残余粒间(溶)孔、晶间(溶)孔、溶洞、裂缝 | |
孔隙类型 | 裂缝-孔洞型、裂缝-孔隙型 | 孔隙型、裂缝-溶孔型 | |
盖层 | 直接盖层 | 中寒武统高台组砂-泥岩;下寒武统筇竹寺组页岩;灯三段页岩 | 石炭系本溪组铝土质泥岩,泥质白云岩,含膏泥白云岩,致密白云岩、灰岩 |
区域盖层 | 筇竹寺组页岩;上二叠统龙潭组页岩 | 石炭系-二叠系陆相泥质岩;奥陶系膏盐岩 |
Table 2
Characteristics of the accumulation system in Anyue and Jingbian gas fields"
气田 | 安岳气田 | 靖边气田 | ||||
---|---|---|---|---|---|---|
气藏 | 震旦系灯影组 | 寒武系龙王庙组 | 奥陶系上组合 | 奥陶系中组合 | 奥陶系下组合 | |
构造位置 | 四川盆地川中古隆起高部位 | 鄂尔多斯盆地中部伊陕斜坡构造转换枢纽带 | ||||
气藏结构 要素 | 烃源体 | 早期二源:筇竹寺组+震旦系烃源岩;晚期古油藏裂解 | 早期单源:筇竹寺组烃源岩;晚期古油藏裂解 | 单源:石炭系-二叠系煤系烃源岩 | 二源:石炭系-二叠系+奥陶系烃源岩 | 单源为主:奥陶系烃源岩 |
聚集体/圈闭体和储层 | 相控岩溶型储层与构造圈闭和盖层构成圈闭体;相控岩溶型储层与致密围岩和盖层构成岩性、地层-岩性圈闭体 | 岩溶储层与致密围岩和盖层构成地层-岩性和岩性圈闭体 | 颗粒滩型储层、膏溶型储层与致密围岩和盖层构成地层-岩性、岩性圈闭体 | 颗粒滩型储层与致密围岩和盖层构成地层-岩性、岩性圈闭体 | ||
输导体 | 源-储接触面、断裂/裂缝 | 断裂/裂缝 | 不整合面、侵蚀古沟槽 | 不整合面、断裂/裂缝 | 断裂/裂缝 | |
油气成藏 过程 | 烃源体供烃期 | 多期持续供烃:志留纪、二叠纪—早侏罗世成油期,中侏罗世—晚白垩世成气高峰期 | 石炭系-二叠系烃源岩持续供烃:晚三叠世—早白垩世成油期,晚白垩世进入成气高峰期;奥陶系烃源岩持续供烃:晚三叠世—晚侏罗世主要成油期,早白垩世进入成气高峰期 | |||
圈闭体形成和改造 | 桐湾期—早加里东期成储,二叠纪峨眉运动改造 | 加里东期成储,二叠纪峨眉运动改造 | 加里东期成储,海西期—印支期深埋,燕山期东部抬升 | |||
输导体形成和改造 | 桐湾期形成不整合面;早加里东期形成走滑断裂,经历东吴、印支、燕山运动的改造 | 加里东期形成不整合面、侵蚀沟槽 | 奥陶纪同沉积断裂活动、加里东运动、海西运动和燕山运动等形成断裂、裂缝 | |||
油气藏形成和改造 | 海西期—印支期古油藏,燕山期古气藏;喜马拉雅期调整改造最终定型 | 白垩纪成藏;燕山期构造反转 | 三叠纪末—早白垩世古油气藏,白垩纪末古气藏;早白垩世末(燕山期)构造反转 | |||
油气富集关键结构 | 早期“二源二位”和“二源三位”结构;晚期古油藏原位裂解,源-储一体(“单源一位”) | 早期“单源三位”结构,断裂输导;晚期古油藏原位裂解,源-储一体(“单源一位”) | “单源二位”结构,源-储紧邻,枢纽带调整成藏 | “二源三位”结构,不整合面、断裂-裂缝-储集层输导 | “单源三位”结构,断裂/裂缝输导 |
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