三塘湖盆地煤炭地下气化地质评价与有利区域

doi:10.7657/XJPG20230306

摘要/Abstract

摘要：

煤炭地下气化是对传统采煤技术的变革，气化炉选址好是煤炭地下气化成功的先决条件。通过煤层厚度、煤层埋藏深度、煤岩煤质、地质构造、煤层顶板岩性及水文地质条件分析，评价三塘湖盆地侏罗系西山窑组煤炭地下气化地质条件。结果表明，西山窑组煤层煤阶较低，灰分和挥发分较高，倾角和埋藏深度适中，顶板岩性为泥岩、粉砂岩和砂岩，断层发育程度低，发育较好的隔水层，具备煤炭地下气化地质条件；同时，优选出构造复杂程度、埋藏深度、煤层厚度等18个有利区三级评价参数，建立适用于三塘湖盆地煤炭地下气化评价的多层次数学模型，将全盆地按照煤炭地下气化潜力划分为Ⅰ类区、Ⅱ类区和Ⅲ类区，其中，马朗凹陷北斜坡和条湖凹陷东缘为煤炭地下气化的有利区域。

关键词: 三塘湖盆地, 西山窑组, 煤层, 煤炭地下气化, 显微组分, 地质条件, 多层次数学模型

Abstract:

Underground coal gasification (UCG) is a revolution in traditional coal mining technology, and the site selection of underground coal gasifier is a prerequisite for a successful UCG project. The geological conditions of UCG of the Jurassic Xishanyao formation in the Santanghu basin were evaluated based on the analysis of coalseam thickness, burial depth of coalseam, coal petrology and quality, geologic structure, roof lithology of coalseam and hydrogeological conditions. The results show that the Xishanyao coalseam is featured with a low coal rank, high ash and volatile matter contents, moderate dip angle and burial depth, and roof lithology consisting of mudstone, siltstone, and sandstone with underdeveloped faults, and good-quality water barriers, which provide favorable geological conditions for UCG. Furthermore, 18 indexes (e.g. structural complexity, burial depth, and coal-seam thickness and so on) for evaluating favorable areas of UCG were identified depending upon the geological characteristics of the Santanghu basin, and a multi-level mathematical model was established for evaluating UCG in the basin. According to UCG potential, the whole basin is divided into TypeⅠ, Type Ⅱ, and Type Ⅲ areas. The northern slope of Malang sag and the eastern margin of Tiaohu sag are defined as the favorable areas for UCG.

Key words: Santanghu basin, Xishanyao formation, coalseam, UCG, maceral, geological condition, multi-level mathematical model

中图分类号:

TE132

王兴刚, 范谭广, 焦立新, 东振, 曹志雄, 韩波. 三塘湖盆地煤炭地下气化地质评价与有利区域[J]. 新疆石油地质, 2023, 44(3): 307-313.

WANG Xinggang, FAN Tanguang, JIAO Lixin, DONG Zhen, CAO Zhixiong, HAN Bo. Geological Evaluation and Favorable Areas of Underground Coal Gasification in Santanghu Basin[J]. Xinjiang Petroleum Geology, 2023, 44(3): 307-313.

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