沁水盆地北缘晋中区块深部煤层气富集规律及有利区优选

Enrichment law of deep coalbed methane and optimization of favorable areas in Jinzhong Block on the northern margin of Qinshui Basin

摘要

综合利用地质、实验测试及试井、测井等资料，以晋中区块太原组15#煤层为研究对象，从煤层气地质特征、沉积、构造和水文控气作用等方面，阐明晋中区块深部煤层气地质特征及富集规律。结果表明：晋中区块太原组 15 \# 煤层埋深呈中部浅和向西北、东南逐渐加深的特征，厚度平均为 6.14 m ，煤体结构以原生-碎裂煤为主，煤岩类型以光亮煤和半亮煤为主，工业组分和显微组分中镜质组、固定碳占绝对优势，最大镜质体反射率介于 2.49 \mathrm{\%} \sim 3.00 \mathrm{\%} ，属于高成熟度优质无烟煤，有利于煤层气生储；孔隙度、渗透率平均分别为 5.48% 和 0.40 \times {10}^{-3} \mu {\mathrm{m}}^2 ，属于高渗透深部煤储层；宏观裂隙、显微裂隙较发育，孔隙以微孔为主导，Langmuir 体积平均为 33.65 m³/t ，煤储层吸附储集能力强，含气量平均为 17.69 m³/t 。晋中区块整体构造由中部北东走向背斜轴部及西北、东南侧向斜单翼组成，西北部断裂发育，中部-东南部断裂相对不发育；煤层顶板多发育高厚度泥岩；水动力条件由西北部向东南部逐渐减弱。构建包括含气量、煤层厚度、埋深、顶底板岩性、断裂发育程度及水动力条件参数的评价指标体系，划分 I 类和 II 类深部煤层气富集有利区。该结果可为晋中区块深部煤层气有利区优选和高效开发提供指导。

Abstract

In order to clarify the enrichment law of deep coalbed methane in Jinzhong Block, geological, experimental testing, well testing, and logging data are comprehensively utilized. Taking the {15}^{\#} coal seam in Jinzhong Block as the research object, the geological characteristics, sedimentation, structure, and hydrological control of coalbed methane are elucidated from the aspects of coalbed methane geological features, sedimentation, structure, and hydrological control. The results show that the burial depth of the {15}^{\#} coal seam in the Taiyuan Formation of the Jinzhong Block is characterized by shallow depth in the middle, gradually deepening towards the northwest and southeast, with an average thickness of 6.14 meters. The coal structure is mainly composed of primary fragmented coal, and the coal rock types are mainly bright coal and semi bright coal. The industrial and microscopic components are dominated by vitrinite and fixed carbon, and the maximum vitrinite reflectance R_o ranges from 2.49% to 3.00%. It belongs to high maturity and high-quality anthracite, which is conducive to coalbed methane generation and storage. The average porosity is 5.48% and permeability is 0.40 \times {10}^{-3} \mu {\mathrm{m}}^2, reservoirs belong to high permeability deep coal reservoirs. Macroscopic and microscopic fractures are relatively developed, with micropores as the main pore. The Langmuir volume average is 33.65 m³/t. The coal reservoir has strong adsorption and storage capacity, with an average gas content of 17.69 m³/t. The overall structure of Jinzhong Block is composed of a central northeast trending anticline axis and northwest and southeast lateral inclined single wings. The northwest part has developed faults, while the central southeast part has relatively underdeveloped faults. High thickness mudstone is often developed on the roof of coal seams. The hydrodynamic conditions gradually weaken from the northwest to the southeast. Construct an evaluation index system including gas content, coal seam thickness, burial depth, roof and floor lithology, degree of fault development, and hydrodynamic conditions parameters, and divide the favorable areas for deep coalbed methane enrichment into Class I and Class II. This result can provide guidance for the optimal selection and efficient development of deep coalbed methane favorable areas in Jinzhong Block.

关键词

沁水盆地北缘 / 晋中区块 / 地质特征 / 深部煤层气 / 富集规律 / 有利区

Key words

northern margin of Qinshui Basin / Jinzhong Block / geological features / deep coalbed methane / enrichment law / favorable areas

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基金资助

中国石化科技攻关项目(P23205)

中国石化科技攻关项目(P23230)

中国石化科技攻关项目(P24118)