高阶煤储集层气水赋存模式的划分与应用

doi:10.7657/XJPG20210509

新疆石油地质 ›› 2021, Vol. 42 ›› Issue (5): 572-578.doi: 10.7657/XJPG20210509

高阶煤储集层气水赋存模式的划分与应用

刘忠¹^,²(), 王宁¹^,², 张永平¹^,², 鲁秀芹¹^,², 李正³, 高燕²

1. 中国石油集团煤层气开采先导试验基地,河北任丘 062552
2. 中国石油华北油田分公司勘探开发研究院,河北任丘 062552
3. 中国石油大学（华东）石油工程学院,山东青岛 266580

收稿日期:2020-06-05 修回日期:2020-12-05 出版日期:2021-10-01 发布日期:2022-09-27
作者简介:刘忠（1974-）,男,内蒙古化德人,高级工程师,煤层气勘探与开发,（Tel）16630755645（E-mail） mcq_liuz@petrochina.com.cn
基金资助:
国家科技重大专项(2017ZX05064);中国石油股份公司重大专项(2017E-1404)

Division and Application of Gas/Water Occurrence Models in High-Rank Coal Reservoirs

LIU Zhong¹^,²(), WANG Ning¹^,², ZHANG Yongping¹^,², LU Xiuqin¹^,², LI Zheng³, GAO Yan²

1. CBM Exploration and Development Pilot Test Base, CNPC, Renqiu, Hebei 062552, China
2. Research Institute of Exploration and Development, Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062552, China
3. School of Petroleum Engineering, China University of Petroleum, Qingdao, Shandong 266580, China

Received:2020-06-05 Revised:2020-12-05 Online:2021-10-01 Published:2022-09-27

摘要/Abstract

摘要：

以沁水盆地南部郑庄和马必东区块成藏主控因素为研究对象,利用分子模拟技术开展煤储集层微观气水赋存规律研究,论证了微观孔隙中甲烷赋存模式,结合评价井测试含气量、压裂和排采资料,根据微裂缝模型和边界层效应,建立考虑低渗裂缝动边界效应的动平衡赋存模型。结果表明,无水状态甲烷在直径为2 nm的孔隙中主要为吸附态,随含气饱和度增大,水分子的竞争作用减弱。明确了气水相压力、毛细管力和黏滞力间的压力平衡关系,将气水压力平衡模式划分为逸散模式和封存模式;分析了4种气水赋存模式对后期排采效果的影响,认为第Ⅲ类和第Ⅳ类气水赋存模式产气量较高。

关键词: 沁水盆地, 煤储集层, 气水赋存模式, 分子模拟, 边界动平衡, 临界解吸压力

Abstract:

By analyzing the factors controlling hydrocarbon accumulation in Zhengzhuang block and Mabidong block in the southern Qinshui basin, and using molecular simulation technology, the microscopic laws of gas/water occurrence in the coal reservoirs were studied, then the occurrence models of methane in microscopic pores were demonstrated, and finally dynamic balance occurrence models considering the dynamic boundary effect of low-permeability fractures were established based on evaluation well data (i.e. measured gas content, fracturing stimulation and production data), microfracture models and boundary layer effects. The results show that anhydrous methane mainly adsorbs to the pores with a diameter of 2 nm, and as the gas saturation increases, the competition among water molecules weakens. The balance relationship among viscous force, gas/water phase pressure and capillary force is defined. The gas/water pressure balance models are divided into escaping and occluding modes. After analyzing the influences of 4 types of gas/water occurrence models on later production, it is believed that the gas output of Type Ⅲ and Type Ⅳ models is relatively higher.

Key words: Qinshui basin, coal reservoir, gas/water occurrence model, molecular simulation, dynamic boundary balance, critical desorption pressure

中图分类号:

P618.11

刘忠, 王宁, 张永平, 鲁秀芹, 李正, 高燕. 高阶煤储集层气水赋存模式的划分与应用[J]. 新疆石油地质, 2021, 42(5): 572-578.

LIU Zhong, WANG Ning, ZHANG Yongping, LU Xiuqin, LI Zheng, GAO Yan. Division and Application of Gas/Water Occurrence Models in High-Rank Coal Reservoirs[J]. Xinjiang Petroleum Geology, 2021, 42(5): 572-578.

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高阶煤储集层气水赋存模式的划分与应用

Division and Application of Gas/Water Occurrence Models in High-Rank Coal Reservoirs

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