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地质科学  2015, Vol. 50 Issue (1): 330-339    DOI: 10.3969/j.issn.0563-5020.2015.22
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川西坳陷新场气田水文地质地球化学特征及天然气运聚
周孝鑫1, 楼章华2, 朱蓉2, 朱宏权3, 黎华继3, 李飞1
1. 浙江大学建筑工程学院水文与水资源工程研究所 杭州 310058;
2. 浙江大学海洋科学与工程学系 海洋资源研究所 杭州 310058;
3. 中石化西南油气分公司 成都 610081
Hydrogeology geochemical characteristics of continental formation water in Xinchang gas field,western Sichuan depression and gas migration and accumulation
Zhou Xiaoxin1, Lou Zhanghua2, Zhu Rong2, Zhu Hongquan3, Li Huaji3, Li Fei1
1. Institute of Hydrology and Water Resources, College of Civil Engineering, Zhejiang University, Hangzhou 310058;
2. Department of Ocean Sciences and Engineering, Zhejiang University, Hangzhou 310058;
3. SINOPEC Southwest Oilfield Company, Chengdu 610081
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摘要 新场气田是川西的主力产气区,发育深层上三叠统(须家河组二段、须家河组四段)和中浅层中、上侏罗统(上沙溪庙组、蓬莱镇组)含气层系,均不同程度地产出地层水,气水关系复杂,不同层位间气水存在一定的联系.纵向上,深层地层水埋深为3 000~5 500 m,随埋深增加矿化度、盐化系数逐渐增大,呈现高演化地层水特征; 中浅层地层水埋深为500~2 200 m,沟通较频繁,水化学特征差异不大,均呈现低矿化度、低盐化系数和高碳酸氢根离子浓度特点; 两者之间为地层水混合过渡带.平面上,中浅层上沙溪庙组地层水矿化度在断裂发育带附近出现高值,高值范围与深层须家河组地层水矿化度低值区基本相对应.这主要是由局部深层与中浅层地层水沿向下断至深层、向上断至中浅层的断层垂向沟通并发生混合作用导致的.中浅层断裂附近,沿断裂带上涌的深层地层水与中浅层原始沉积地层水发生混合作用,使得砂体富含高矿化度地层水,天然气则沿渗透性砂体侧向运移并在一定距离的圈闭内聚集成藏,这对研究区中浅层天然勘探具有指导意义.
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关键词川西坳陷   新场气田   含气层系   水文地质地球化学   混合作用     
Abstract: Xinchang gas field is the main gas production district of Chuanxi depression. The gas-bearing beds are deep Xujiahe Formation (Section 2 and 4) of the Upper Triassic and Middle-Upper Jurassic (Shangshaximiao Formation and Penglaizhen Formation), which all produce groundwater more or less. It indicates that there is complex relationship between gas and groundwater. Inherent connections of liquid exist between shallow-middle fluid and deep fluid. Low salinity, low coefficient of salinization and high HCO3- ionic concentration in the formation (depth between 500~2 200 m) may resulted from the frequency exchange of shallow-middle formation water in vertical. The formation water with the characteristics of high salinity and high coefficient of salinization in the depth of 3 000~5 500 m are mainly contributed by the formation water concentrated gradually with the depth increase. The formation water presented the characteristics of intermingling water in the depth of 2 200 m~3 000 m. The characteristics of formation water salinity on horizontal distribution in Jurassic formation are different from the characteristics in the Upper Triassic. The salinity of formation water in Shangshaximiao Formation is high in the fault district while it is relative low in Section 2 of the Upper Triassic at the corresponding district. The deep liquid connected with shallow-middle liquid by the fault. The shallow-middle formations are filled with high salinity formation water in the fracture district while the gas gathered in the favorable traps in a certain distance away from the faults in shallow-middle formation.
Key wordsWestern Sichuan depression   Xinchang gas field   Gas-bearing bed   Geochemical characteristics   Intermingling   
收稿日期: 2013-12-06;
基金资助:

国家重大专项"中西部重点碎屑岩领域油气富集规律与分布预测"(编号: 2011ZX05002-006-003HZ)资助

作者简介: 周孝鑫,男,1988年5月生,硕士研究生,水文地质学专业.E-mail:xinxin7687@126.com
引用本文:   
. 2015, 川西坳陷新场气田水文地质地球化学特征及天然气运聚. 地质科学, 50(1): 330-339.
. Hydrogeology geochemical characteristics of continental formation water in Xinchang gas field,western Sichuan depression and gas migration and accumulation[J]. Chinese Journal of Geology, 2015, 50(1): 330-339.
 
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[2] 韩宝平. 冀中拗陷古潜山油田水化学研究[J]. 地质科学, 1989, (3): 263-273.
 
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