川西坳陷中段侏罗系次生气藏地层水化学特征及与油气运聚关系

叶素娟; 李嵘; 张世华

doi:10.11781/sysydz201404487

川西坳陷中段侏罗系次生气藏地层水化学特征及与油气运聚关系

doi: 10.11781/sysydz201404487

1.
中国石化西南油气分公司勘探开发研究院, 成都 610041
2. 成都地质矿产研究所, 成都 610081

基金项目: 国家科技重大专项（2011ZX05002-004-001）资助。

详细信息

作者简介:
叶素娟（1969—），女，博士，高级工程师，从事储层与成藏研究。E-mail: sujuan_ye@hotmail.com。

通讯作者:
李嵘（1967—），男，教授级高级工程师，从事沉积及储层研究。E-mail: 545210420@qq.com。

中图分类号: TE133
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出版历程
- 收稿日期: 2014-03-24
- 修回日期: 2014-05-25
- 刊出日期: 2014-07-28

Chemical characteristics of Jurassic formation water and its relationship with hydrocarbon migration and accumulation in middle part of Western Sichuan Depression

1.
Exploration and Production Research Institute of SINOPEC Southwest Company, Chengdu, Sichuan 610041, China
2. Chengdu Institute of Geology and Mineral Resources, Chengdu, Sichuan 610081, China

摘要

摘要: 川西坳陷侏罗系地层水化学研究结果表明，侏罗系地层水以CaCl₂型为主，其中上侏罗统蓬莱镇组见较多Na₂SO₄型地层水，结合地层水离子参数，总体上地层水封闭条件较好，有利于油气的聚集和保存。侏罗系地层水化学特征在垂向和平面上表现出明显的垂直分带性和平面分区性。纵向上，侏罗系地层水总体表现出断层越流淡化地层水的特征；平面上，地层水矿化度、主要离子浓度受构造位置以及断裂系统控制。构造位置较高或邻近烃源断层的地区，侏罗系地层水受大气水下渗淡化作用和须家河组五段湖相泥岩黏土矿物脱水淡化作用影响。与中国大部分油气田不同，川西坳陷侏罗系次生气藏主要分布在矿化度小于30 g/L，HCO₃^-浓度大于300 mg/L的区域。须家河组五段烃源岩黏土矿物转化析出的大量低矿化度层间水与有机质热演化和硫酸盐还原作用形成的烃类和CO₂气体，在断层沟通下上涌进入侏罗系储层，导致低矿化度、高HCO₃^-浓度地层水的分布范围与气藏分布有较好的一致性。在断层欠发育地区，地层垂向连通性差，侏罗系次生气藏难以形成，地层水具有较高的矿化度和较低的HCO₃^-浓度。
- 地层水化学 /
- 油气运聚 /
- 次生气藏 /
- 侏罗系 /
- 川西坳陷
Abstract: Studies on the chemistry of the Jurassic formation water indicate that the formation water is dominantly characterized by CaCl₂ type with relatively low salinity and Na₂SO₄ type water is common in the Upper Jurassic Penglaizhen Formation. In general, the Jurassic formation water is in a closed system, demonstrating its favorableness for hydrocarbon accumulation and preservation. There is a distinct difference in the chemistry of formation water vertically and horizontally. Water composition varies with depth and three vertical variation patterns might be observed, showing the diluting effect caused by the cross-formation flow through faults. Regionally, formation water chemistry is mainly controlled by elevation and faults. In regions of high elevation and fault zones, formation water dilution can occur by meteoric invasion and diagenetic dehydration reactions of lacustrine facies clay minerals in the 5th section of the Xujiahe Formation within the main hydrocarbon source rocks. The Jurassic secondary gas pools in the Western Sichuan Depression correspond generally to the regions with TDS lower than 30 g/L and bicarbonate concentration higher than 300 mg/L, which is different from most oil and gas fields in China. The low-salinity water released from the transformation of smectite to illite and the hydrocarbon and carbon dioxide generated by kerogen-cracking reaction and sulfate-reducing reaction can flow upward through permeable fault zones and therefore cause the coincidence between the distributions of hydrocarbon and formation water with low TDS and high bicarbonate concentration. In regions without faults, it is unlikely to form hydrocarbon accumulation and the formation waters are often characterized by high TDS and low bicarbonate concentration due to poor vertical connectivity.
- formation water chemistry /
- hydrocarbon migration and accumulation /
- secondary gas pool /
- Jurassic /
- Western Sichuan Depression

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参考文献(19)

[1]	汪蕴璞,林锦璇,汪林.论含油气盆地含水系统和水文地质期的划分:以东海西湖凹陷为例[J].地球科学:中国地质大学学报,1995,20(4):393-398. Wang Yunpu,Lin Jinxuan,Wang Lin.Division of water-bearing systems and hydrogeological periods of oil (gas)-bearing basin:with Xihu depression in East China Sea as an example[J].Earth Science,1995,20(4):393-398.
[2]	孙向阳,刘方槐.沉积盆地中地层水化学特征及其地质意义[J].天然气勘探与开发,2001,24(4):47-53. Sun Xiangyang,Liu Fanghuai.The formation water chemistry and geological significance of sedimentary basin[J].Natural Gas Exploration & Development,2001,24(4):47-53.
[3]	楼章华,朱蓉,金爱民,等.沉积盆地地下水与油气成藏—保存关系[J].地质学报,2009,83(8):1188-1194. Lou Zhanghua,Zhu Rong,Jin Aimin,et al.Relationship between groundwater and hydrocarbon accumulation-preservation in sedimentary basin[J].Acta Geologica Sinica,2009,83(8):1188-1194.
[4]	梁积伟,李荣西,陈玉良.鄂尔多斯盆地苏里格气田西部盒8段地层水地球化学特征及成因[J].石油与天然气地质,2013,34(5):625-630. Liang Jiwei,Li Rongxi,Chen Yuliang.Geochemical behaviors and genesis of formation water in 8 the Member of Xiashihezi Formation in western Sulige gas field,Ordos Basin[J].Oil & Gas Geo-logy,2013,34(5):625-630.
[5]	任国选,侯读杰,史玉玲,等. 准噶尔盆地西北缘红山嘴油田地层水特征与油气藏聚集关系[J].石油与天然气地质,2013,34(2):179-184. Ren Guoxuan,Hou Dujie,Shi Yuling,et al.Relationship between formation water characteristics and hydrocarbon accumulation in Hongshangzui oilfield in the northwestern margin of the Junggar Basin[J].Oil & Gas Geology,2013,34(2):179-184.
[6]	赵利杰,蒋有录,刘华,等.饶阳凹陷留西—留北地区新近系地层水特征及其与油气分布的关系[J].地球科学与环境学报,2012,34(2):57-63. Zhao Lijie,Jiang Youlu,Liu Hua,et al.Characteristics of Neogene formation water and its response to hydrocarbon distribution in Liuxi-Liubei area of Raoyang Sag[J].Journal of Earth Sciences and Environment,2012,34(2):57-63.
[7]	王亮,胡恒波,张鹏飞,等.川西栖霞组储层测井识别与流体性质判断[J].特种油气藏,2012,19(4):18-20. Wang Liang,Hu Hengbo,Zhang Pengfei,et al.Logging identification of reservoirs and fluid property in the Qixia Formation in west Sichuan Basin[J].Special Oil & Gas Reservoirs,2012,19(4):18-20.
[8]	惠潇,田永强.鄂尔多斯盆地天环拗陷南段水文地质特征与油藏富集规律[J].地球科学与环境学报,2008,30(3):278-282. Hui Xiao,Tian Yongqiang.Hydrogeologic features and enrichment laws of oil reservoirs in South Tianhuan Depression, Ordos Basin[J].Journal of Earth Sciences and Environment,2008,30(3):278-282.
[9]	蔡开平,廖仕孟.川西地区侏罗系气藏气源研究[J].天然气工业,2000,20(1):36-41. Cai Kaiping,Liao Shimeng.A research on the gas source of Jurassic gas reservoirs in Western Sichuan Basin[J].Natural Gas Industry,2000,20(1):36-41.
[10]	秦胜飞,戴金星,王兰生.川西前陆盆地次生气藏天然气来源追踪[J].地球化学,2007,36(4):368-374. Qin Shengfei,Dai Jinxing,Wang Lansheng.Different origins of natural gas in secondary gas pool in Western Sichuan foreland basin[J].Geochimica,2007,36(4):368-374.
[11]	沈忠民,刘涛,吕正祥,等.川西坳陷侏罗系天然气气源对比研究[J].高校地质学报,2008,14(4):577-582. Shen Zhongmin,Liu Tao,Lü Zhengxiang,et al.A comparison study on the gas source of Jurassic natural gas in the Western Sichuan Depression[J].Geological Journal of China Universities,2008,14(4):577-582.
[12]	杨克明,朱宏权.川西叠覆型致密砂岩气区地质特征[J].石油实验地质,2013,35(1):1-8. Yang Keming,Zhu Hongquan.Geological characteristics of superposed tight sandstone gas-bearing areas in western Sichuan[J].Petroleum Geology & Experiment,2013,35(1):1-8.
[13]	唐宇,吕正祥,叶素娟,等.成都凹陷上侏罗统蓬莱镇组天然气运移特征与富集主控因素[J].石油与天然气地质,2013,34(3):281-287. Tang Yu,Lü Zhengxiang,Ye Sujuan,et al.Characteristics and controlling factors of natural gas migration and accumulation in the Upper Jurassic Penglaizhen Formation of Chengdu Sag[J].Oil & Gas Geology,2013,34(3):281-287.
[14]	吴世祥,江泽成,张林.川西侏罗系成藏主控因素及分类[J].天然气工业, 2001,21(4):20-23. Wu Shixiang,Jiang Zecheng,Zhang Lin.Gas pool types and dominating pool formation factors of Jurassic system in Western Sichuan basin[J].Natural Gas Industry,2001,21(4):20-23.
[15]	李巨初,刘树根,徐国盛,等.川西前陆盆地流体的跨层流动[J].地质地球化学,2001,29(4):73-81. Li Juchu,Liu Shugen,Xu Guosheng,et al.Cross formational migration of fluids in the compact sandstone type gas field,West Sichuan foreland basin[J].Geology Geochemistry,2001,29(4):73-81.
[16]	沈忠民,宫亚军,刘四兵,等.川西坳陷新场地区上三叠统须家河组地层水成因探讨[J].地质论评,2010,56(1):82-88. Shen Zhongmin,Gong Yajun,Liu Sibing, et al.A discussion on genesis of the Upper Triassic Xujiahe Formation water in Xinchang area,Western Sichuan Depression[J].Geological Review,2010,56(1):82-88.
[17]	沈忠民,刘四兵,吕正祥,等.川西坳陷中段陆相地层水纵向变化特征及水—岩相互作用初探[J].沉积学报,2011,29(3):495-502. Shen Zhongmin,Liu Sibing,Lü Zhengxiang,et al.Vertical gechemical characteristics of continental formation water and its water-rock interaction in the middle area of western Sichuan depression[J].Acta Sedimentologica Sinica,2011,29(3):495-502.
[18]	刘四兵,沈忠民,刘昊年,等.川西坳陷中段上三叠统须家河组水岩相互作用机制[J].石油学报,2013,34(1):47-58. Liu Sibing,Shen Zhongmin,Liu Haonian,et al.Mechanism of water-rock interaction of the Upper Triassic Xujiahe Formation in the middle part of western Sichuan depression[J].Acta Petrolei Sinica,2013,34(1):47-58.
[19]	刘树根,李智武,曹俊兴,等.龙门山陆内复合造山带的四维结构构造特征[J].地质科学,2009,44(4):1151-1180. Liu Shugen,Li Zhiwu,Cao Junxing,et al.4-D textural and structural characteristics of Longmen intracontinental composite orogenic belt,Southwest China[J].Chinese Journal of Geology,2009,44(4):1151-1180.