川中北部磨溪—高石梯地区地层水特征及其油气地质意义

doi:10.12108/yxyqc.20210305

岩性油气藏 ›› 2021, Vol. 33 ›› Issue (3): 54–62.doi: 10.12108/yxyqc.20210305

川中北部磨溪—高石梯地区地层水特征及其油气地质意义

苏敏^1,2, 吴康军^1,2, 李志军^1,2, 曾东方³, 陈颖^1,2, 卢科良^1,2, 朱敏^1,2, 龚燕秀⁴

1. 重庆科技学院石油与天然气工程学院, 重庆 401331;
2. 复杂油气田勘探开发重庆市重点实验室, 重庆 401331;
3. 中国石油新疆油田分公司石西油田作业区, 新疆克拉玛依 834000;
4. 中国石油西南油气田分公司川中油气矿研究所, 四川遂宁 629000

收稿日期:2020-03-04 修回日期:2020-08-17 发布日期:2021-06-03
通讯作者: 吴康军(1983-),男,博士,讲师,主要从事油气地质和非常规油气勘探方面的教学和研究工作。Email:wukangjun520@163.com。 E-mail:wukangjun520@163.com。
作者简介:苏敏（1999—），女，重庆科技学院在读硕士研究生，研究方向为油气运移与成藏。地址：（401331）重庆市沙坪坝区大学城东路20号重庆科技学院。Email：958571159@qq.com
基金资助:
国家自然科学基金“自然演化碎屑锆石裂变径迹的初始径迹长度及径迹长度的影响因素探究”（编号：41802154）和重庆科技学院校内基金项目“过成熟海相泥页岩有机孔发育的控制因素及演化机理”（编号：ck2017zkyb008）联合资助

Characteristics of formation water and its geological significance in Moxi-Gaoshiti area, north-central Sichuan Basin

SU Min^1,2, WU Kangjun^1,2, LI Zhijun^1,2, ZENG Dongfang³, CHEN Ying^1,2, LU Keliang^1,2, ZHU Min^1,2, GONG Yanxiu⁴

1. School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China;
2. Key Laboratory of Exploration and Development of Complex Oil and Gas Fields in Chongqing, Chongqing 401331, China;
3. Shixi Oil Field Operation Area, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
4. Central Sichuan Oil and Gas Field Research Institute, PetroChina Southwest Oil & Gas Field Company, Suining 629000, Sichuan, China

Received:2020-03-04 Revised:2020-08-17 Published:2021-06-03

摘要/Abstract

摘要： 川中北部磨溪-高石梯地区是四川盆地天然气的主要产区，但该区地层水特征及其油气地质意义方面的研究比较薄弱。基于油气运移聚集理论，在分析地层水的离子组成、化学参数、氢氧同位素等特征的基础上，揭示了地层水特征与油气聚集的关系。结果表明：龙王庙组、长兴组、雷一1亚段和须家河组的地层水均以CaCl2型为主，嘉二段以CaCl₂，MgCl₂，Na₂SO₄等3种水型为主。雷一¹亚段和须家河组地层水的矿化度高，龙王庙组次之，嘉二段和长兴组的矿化度低。5个产层地层水的钠氯系数为0.3~0.8，镁钙系数为0.1~0.5，其中嘉二段脱硫系数最大（大于2），龙王庙组脱硫系数为0.2~0.5，长兴组和雷一¹亚段脱硫系数相当，为0.1~0.8，须家河组脱硫系数为0。川中北部地区天然气保存条件较好，须家河组封闭性最好，岩-水作用强，嘉二段封闭性最差，岩-水作用弱。

关键词: 地层水, 化学特征, 离子组成, 氢氧同位素, 磨溪—高石梯地区

Abstract: The Moxi-Gaoshiti area is the main natural gas producing area in Sichuan Basin，but the study on the formation water characteristics and its geological significance with oil and gas is still weak. Based on the theory of hydrocarbon migration and accumulation，combined with the analysis of ion composition，chemical parameters，hydrogen-oxygen isotopes of formation water，the relationship between formation water characteristics and hydrocarbon accumulation was revealed. The results show that the formation water is mainly of CaCl₂ type in Longwangmiao Formation，Changxing Formation，submember of Leikoupo Formation（Lei-1¹ submember）and Xujiahe Formation，while mainly of CaCl₂，MgCl₂ and Na₂ SO₄ type in the second member of Jialingjiang Formation（Jia-2 member）. The salinity of formation water in Lei-1¹ submember and Xujiahe Formation is high，followed by Longwangmiao Formation，and low in Jia-2 member and Changxing Formation. The sodium chlorine coefficient of formation water in the five production layers ranges from 0.3 to 0.8，and the magnesium calcium coefficient ranges from 0.1 to 0.5. The desulfurization coefficient of Jia-2 member is the largest（greater than 2）， the desulfurization coefficient of Longwangmiao Formation ranges from 0.2 to 0.5， and the desulfurization coefficient of Changxing Formation and Lei-11 submember is equivalent，ranging from 0.1 to 0.8，while the desulfurization coefficient of Xujiahe Formation is 0. The natural gas has good preservation conditions in the north-central Sichuan Basin. The formation sealing of Xujiahe Formation is the best，the rock-water interaction is strong， while the formation sealing of Jia-2 member is the worst， and the rock-water interaction is weak.

Key words: formation water, chemical characteristics, ion composition, hydrogen and oxygen isotopes, Moxi-Gaoshiti area

中图分类号:

TE133+2

苏敏, 吴康军, 李志军, 曾东方, 陈颖, 卢科良, 朱敏, 龚燕秀. 川中北部磨溪—高石梯地区地层水特征及其油气地质意义[J]. 岩性油气藏, 2021, 33(3): 54–62.

SU Min, WU Kangjun, LI Zhijun, ZENG Dongfang, CHEN Ying, LU Keliang, ZHU Min, GONG Yanxiu. Characteristics of formation water and its geological significance in Moxi-Gaoshiti area, north-central Sichuan Basin[J]. Lithologic Reservoirs, 2021, 33(3): 54–62.

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川中北部磨溪—高石梯地区地层水特征及其油气地质意义

Characteristics of formation water and its geological significance in Moxi-Gaoshiti area, north-central Sichuan Basin

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