渝西大安地区上二叠统龙潭组煤岩气地质特征及勘探前景

doi:10.3969/j.issn.1672-7703.2024.04.008

摘要/Abstract

摘要： 上二叠统龙潭组煤系地层是四川盆地重要的烃源岩层系，在钻探过程中普遍见到良好的油气显示，但前期的研究工作仅停留在烃源岩评价层面，未对煤岩气的地质条件开展评价。基于此，通过对渝西大安地区龙潭组煤岩的取心实测数据和相关钻井资料的综合分析，对龙潭组煤岩的分布特征、烃源特征、储层特征、含气性特征和保存条件等方面进行了研究，明确了渝西大安地区龙潭组煤岩气地质条件及勘探前景。研究认为：大安地区位于龙潭组煤岩沉积有利相带，煤岩广泛分布，单层厚度薄，发育较为集中；煤岩结构以原生结构为主，具有中低灰分特征，割理和孔隙发育；煤岩含气性好，游离气含量高，具有高孔隙度、高地层压力和高含气量的特征；煤岩顶底板发育泥岩，保存条件好。综合评价表明，大安地区龙潭组煤岩孔渗性好、含气量高且埋深适中，具有良好的勘探前景。

关键词: 四川盆地, 大安地区, 龙潭组, 煤岩气, 地质特征, 勘探前景

Abstract: The coal measure strata in the Upper Permian Longtan Formation serve as important source rock in Sichuan Basin, and good oil and gas displays have commonly been observed during well drilling. However, the previous study work only focused at the level of source rock evaluation, and there was a lack of evaluation on geological conditions of coal measure gas. Based on the comprehensive analysis of core measurement data and well drilling data of Longtan Formation in Da’an area in Western Chongqing, the distribution characteristics, source rock characteristics, reservoir properties, gas bearing property, and preservation conditions have been studied, which support to determine the geological conditions and exploration prospects of coal measure gas in Longtan Formation in Da’an area in Western Chongqing. The study results show that Da’an area was located in the favorable sedimentary zone during the deposition of Longtan Formation coal measure strata,with wide distribution area, thin single layer thickness, and concentrated coal accumulation area; The coal rock is dominated by primary structure, medium-low ash content, and well developed cleats and pores; The coal rock has good gas bearing property, high free gas content,high porosity, high formation pressure and high gas content; The roof and floor of coal rock are mainly composed of mudstone, showing good preservation conditions. The comprehensive evaluation indicates that the coal measure reservoir in Longtan Formation in Da’an area has good porosity and permeability, high gas content, and moderate burial depth, which shows great exploration prospects.

中图分类号:

TE122.2

舒红林, 章超, 程青松, 苏展鸿, 张涵冰, 郭宁, 孟阳. 渝西大安地区上二叠统龙潭组煤岩气地质特征及勘探前景[J]. 中国石油勘探, 2024, 29(4): 99-110.

Shu Honglin, Zhang Chao, Cheng Qingsong, Su Zhanhong, Zhang Hanbing, Guo Ning, Meng Yang. Geological characteristics and exploration prospects of coal measure gas in the Upper Permian Longtan Formation in Da’an area in Western Chongqing[J]. China Petroleum Exploration, 2024, 29(4): 99-110.

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