澳大利亚苏拉特盆地Surat区块低煤阶煤层定量表征与区带划分优选

中国石油勘探

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澳大利亚苏拉特盆地Surat区块低煤阶煤层定量表征与区带划分优选

崔泽宏,苏朋辉,刘玲莉,李铭,王建俊,孔祥文

中国石油勘探开发研究院

作者简介:崔泽宏（1976-），男，黑龙江富锦人，博士，2008年毕业于中国石油大学（北京），高级工程师，现主要从事煤层气地质工程一体化与开发部署规划方面的工作。地址：北京市海淀区学院路20号院，邮政编码：100083。
基金资助:
国家科技重大专项“海外重点探区目标评价与未来领域选区选带研究(2016ZX05029005)；中国石油天然气集团有限公司“十四五”前瞻性基础性科技项目“澳大利亚低煤阶煤层气高效开发关键技术研究”（2021DJ3304）。

Quantitative characterization, exploration zone classification and favorable area selection of low-rank coal seam gas in Surat block in Surat Basin, Australia

Cui Zehong, Su Penghui, Liu Lingli, Li Ming, Wang Jianjun, Kong Xiangwen

PetroChina Research Institute of Petroleum Exploration & Development

摘要/Abstract

摘要： 澳大利亚苏拉特盆地东缘Surat区块低煤阶煤层地质特征差异显著，如何优选有利区是实现研究区煤层气规模经济开发的关键。以大量测井数据、岩心实验数据、试井数据为基础，对巨厚煤系地层的多而薄的煤层进行精细刻画，定量表征煤层厚度、含气量和渗透率等参数的空间分布特征。以三维地质模型为平台，根据煤层参数空间分布差异特征，将研究区划分为3类区带：Ⅰ类区带位于斜坡带构造高部位，毗邻剥蚀区，煤层气藏为高渗高丰度区，煤层厚度为18～40m（埋深大于等于150m），干燥无灰基含气量为3.8～6.5m³/t，渗透率为20～550mD（平均为250mD），为后期规模开发最有利区带；Ⅱ类区带位于斜坡带顶部内剥蚀区，煤层气藏为高渗较低丰度区，煤层厚度为8～20m（埋深大于等于150m），干燥无灰基含气量为2.8～4.2m³/t，渗透率为500～900mD（平均为680mD），属于潜力区带；Ⅲ类区带位于斜坡带构造低部位，煤层气藏为中低渗高丰度区，煤层厚度为18～41m，干燥无灰基含气量为4.8～7.8m³/t，渗透率为0.1～20mD（平均为5mD），煤层气自然可采性相对较差。根据区带划分结果认为，Ⅰ类区带为研究区产能建设的有利选区，Ⅱ类区带可作为Ⅰ类区带开发中后期接替补充，Ⅲ类区带渗透性相对较低，可考虑小井距开发，实现产量提升。

关键词: 苏拉特, 低煤阶, 煤层表征, 区带划分, 有利区带

Abstract: There are significant differences in geological characteristics of low-rank coal seams in Surat block on the eastern margin of Surat Basin, Australia. The optimal selection of favorable exploration area is the key to realize the large-scale and benefit CBM development in the study area. Based on a large number of logging, core lab test and well testing data, fine characterization of multiple and thin coal seams is conducted of a huge thick coal measure strata, and the spatial distribution of coal reservoir properties is quantitatively analyzed, such as coal thickness, gas content, and permeability. Based on the 3D geological model, the study area is divided into three classes of zones according to the spatial distribution of coal reservoir properties. Class I zone is located at the structural high on the slope and adjacent to the denudation zone, and the CBM reservoir is characterized by high permeability and high resource abundance, with coal seam thickness of 18-40 m (burial depth≥150 m), dry ash-free gas content of 3.8-6.5 m3/t, permeability of 20-500 mD (average 250 mD), which is the most favorable area for the large-scale development in the near future. Class Ⅱ zone is located at the denudation zone on the top of the slope, and the CBM reservoir is characterized by high permeability and low resource abundance, with coal seam thickness of 8-20 m (burial depth≥150m), dry ash-free gas content of 2.8-4.2 m3/t, and permeability of 500-900 mD (average 680 mD), which is a potential area. Class Ⅲ zone is located at the structural low on the slope, and the CBM reservoir is characterized by medium-low permeability and high resource abundance, with coal seam thickness of 18-41 m, dry ash-free gas content of 4.8-7.8 m3/t, permeability of 1-20 mD (average 5 mD), and poor natural recoverability. The classification of exploration zone shows that the Class Ⅰ zone is a favorable area for capacity construction in the study area; Class Ⅱ zone is the replacement and supplement area in the middle and late development stage of Class Ⅰ zone; Class Ⅲ zone has relatively low permeability, and small well spacing development can be applied to increase gas production.

Key words: Surat , Low rank, Coal reservoir characterization, Zone division, Favorable Area

中图分类号:

TE122.2

崔泽宏, 苏朋辉, 刘玲莉, 李铭, 王建俊, 孔祥文. 澳大利亚苏拉特盆地Surat区块低煤阶煤层定量表征与区带划分优选[J]. 中国石油勘探.

Cui Zehong, Su Penghui, Liu Lingli, Li Ming, Wang Jianjun, Kong Xiangwen. Quantitative characterization, exploration zone classification and favorable area selection of low-rank coal seam gas in Surat block in Surat Basin, Australia[J]. China Petroleum Exploration.

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