鄂尔多斯东北部致密砂岩气藏地层水成因及分布规律

doi:10.11743/ogg20190210

石油与天然气地质 ›› 2019, Vol. 40 ›› Issue (2): 313-325.doi: 10.11743/ogg20190210

鄂尔多斯东北部致密砂岩气藏地层水成因及分布规律

陈朝兵¹, 杨友运¹, 邵金辉², 朱玉双³, 陈新晶⁴, 石磊⁵, 孟迪³

1. 西安石油大学地球科学与工程学院, 陕西西安 710065;
2. 中国石油长庆油田分公司勘探开发研究院, 陕西西安 710021;
3. 西北大学地质学系大陆动力学国家重点实验室, 陕西西安 710069;
4. 中国石油长庆油田分公司第六采油厂, 陕西西安 710200;
5. 中国石油长庆油田分公司第二采气厂, 陕西西安 710200

收稿日期:2018-05-11 修回日期:2018-12-03 出版日期:2019-04-28 发布日期:2019-01-23
通讯作者: 朱玉双(1968-),女,教授,博士生导师,油气田开发。E-mail:642617295@qq.com。 E-mail:642617295@qq.com
第一作者简介:陈朝兵(1984-),男,博士,讲师,油气成藏与储层评价。E-mail:395286273@qq.com。
基金项目:
国家科技重大专项（2016ZX05050006）；国家自然科学青年基金项目（41802140）。

Origin and distribution of formation water in tight sandstone reservoirs in the northeastern Ordos Basin

Chen Zhaobing¹, Yang Youyun¹, Shao Jinhui², Zhu Yushuang³, Chen Xinjing⁴, Shi Lei⁵, Meng Di³

1. School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China;
2. Research Institute of Petroleum Exploration and Development of Changqing Oilfield Branch Company, PetroChina, Xi'an, Shaanxi 710021, China;
3. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an, Shaanxi 710069, China;
4. No.6 Oil Production Plant, Changqing Oilfield Company, PetroChina, Xi'an, Shaanxi 710200, China;
5. No.2 Gas Production Plant, Changqing Oilfield Company, PetroChina, Xi'an, Shaanxi 710200, China

Received:2018-05-11 Revised:2018-12-03 Online:2019-04-28 Published:2019-01-23

摘要/Abstract

摘要： 通过地震、钻井、测井及生产动态等资料，结合压汞、气水相渗、物性和水化学等测试分析，对鄂尔多斯盆地东北部神木气田地层水的化学特征、成因、空间分布特征及控制因素进行了研究。研究区处于气水过渡区，地层水属于“Ⅴ”型CaCl₂型，以低矿化度的“酸点水”和高矿化度的常规地层水为主。纵向上，各层之间沉积、岩相差异及距气源远近不同是造成地层水纵向差异分布的主要因素。本溪组与太原组层内稳定分布的多套致密灰岩阻碍了烃类进入储层，造成原始气藏充注程度不高，地层水相对富集；石千峰组远离气源中心，烃类供给不足，气驱水不彻底；山西组属“自生自储”成藏组合，充注程度高，产水量少。平面上，受晚白垩世末期盆地“西倾”构造运动影响，盆地东北部整体抬升并发生气水二次调整，导致含气层位增多，连续气柱高度上升；同时气藏压力下降，盆地边缘地层水顺层侵入，各层均不同程度产水，形成“多层含气、普遍低产、气水同产”的格局，表现为自西向东地层水的规模及产水量逐渐增大，矿化度逐渐升高。研究结果为鄂尔多斯盆地边缘气水空间分布及成因理论提供了一定科学依据。

关键词: 气水分布, 酸点水, 地层水, 致密砂岩气, 鄂尔多斯盆地

Abstract: The chemical features,genesis,spatial distribution characteristics and controlling factors of the formation water in Shenmu gas field,northeastern Ordos Basin,were studied by the analysis of seismic,drilling and logging,as well as performance data combined with test analysis of mercury injection,gas-water relative permeability,physical and hydrochemical properties.Since the studied area is located in the transitional area from water to gas,the formation water herein is of "V-shaped" CaCl₂ type,with low salinity"acid water" and high salinity conventional formation water being dominant.Vertically,the differential distribution of formation water are mainly caused by the differences of deposition,lithofacies and distance from gas source for various formations.Multiple tight limestones distributed in the Benxi and Taiyuan Formations have blocked the entry of hydrocarbons into reservoirs,leading to a low degree of gas charging for the original reservoirs and relatively high enrichment of formation water.The Shiqianfeng Formation,located far away from gas source,is in short of hydrocarbon supply with incomplete gas displacement of water.The Shanxi Formation is a self-sourced indi-genous play,which has a high degree of gas charging and low quantity of water produced.Horizontally,influenced by the "west-dipping" structural movement of the basin in the Late Cretaceous,the northeastern Ordos Basin uplifted as a whole along with the secondary adjustment of water/gas contact,producing more gas-bearing horizons and continuously increa-sing the height of gas columns; meanwhile,the pressure in the gas reservoir decreased,and the formation water at the basin margin invaded into bed laterally,leading to the pattern of "multiple gas layers,low gas yield and water-gas co-production",characterized by the ever-increasing formation water scale and water production from west to east with a gradual increase of salinity.The results provide some basis for prediction of the spatial distribution and genesis of gas and water at the margin of the Ordos Basin.

Key words: gas-water distribution, acid water, formation water, tight sand gas, Ordos Basin

中图分类号:

TE133

陈朝兵,杨友运,邵金辉,等. 鄂尔多斯东北部致密砂岩气藏地层水成因及分布规律[J]. 石油与天然气地质, 2019, 40(2): 313-325. doi: 10.11743/ogg20190210 Chen Zhaobing,Yang Youyun,Shao Jinhui,et al. Origin and distribution of formation water in tight sandstone reservoirs in the northeastern Ordos Basin[J]. Oil & Gas Geology, 2019, 40(2): 313-325. doi: 10.11743/ogg20190210

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鄂尔多斯东北部致密砂岩气藏地层水成因及分布规律

Origin and distribution of formation water in tight sandstone reservoirs in the northeastern Ordos Basin

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