黔北地区安场向斜常压页岩气储层特征与主控因素

doi:10.3969/j.issn.1672-7703.2024.02.005

摘要/Abstract

摘要： 黔北地区钻探揭示具有良好的页岩气勘探开发前景，已在正安地区安场向斜内取得重大突破，但表现出不同井间产量存在明显差异，储层发育及主控因素需进一步明确。基于黔北地区安场向斜6口直导眼井的测井、录井及分析化验资料，结合地震及生产数据对五峰组—龙马溪组页岩气储层特征和主控因素开展系统分析。研究认为，黔北地区安场向斜五峰组—龙马溪组一段岩石类型主要为碳质页岩。储层矿物组分主要为石英，平均为58.66%，黏土矿物次之。总体脆性矿物含量高，龙马溪组一段脆性矿物含量平均为77.19%，龙马溪组一段上部脆性矿物含量明显低于下部。五峰组—龙马溪组优质页岩气层储集类型丰富，主要为有机质孔、无机孔和微裂缝；实测孔隙度平均为3.46%，渗透率平均为0.0022mD，总体表现为中—低孔、特低渗储层；有机质类型为Ⅰ型，为高成熟度页岩；总有机碳含量平均为4.58%，总含气量平均为4.85m³/t。进一步分析认为，黔北地区安场向斜五峰组—龙马溪组沉积时期有利的贫氧到缺氧的沉积环境，为有机质的富集奠定了基础，有机质孔的大量发育为储层发育提供了保障，良好的保存条件对页岩气的富集成藏起着关键性作用，压力系数是页岩气产量的决定性因素。

关键词: 黔北地区, 五峰组—龙马溪组, 页岩气, 储层特征, 控制因素

Abstract: The drilling results have indicated good prospects of shale gas exploration and development in the northern Guizhou area, and a major breakthrough has been made in Anchang syncline in Zheng’an area. However, there are distinct differences in shale gas production among wells, and the reservoir development zone and main controlling factors need to be further clarified. The characteristics and main controlling factors of shale gas reservoir in Wufeng-Longmaxi Formation are systematically analyzed by using wireline logging, mud logging, experimental and lab test data from six vertical pilot wells in Anchang syncline in northern Guizhou, as well as seismic and well production data. The study results show that the rock type in Wufeng-the first member of Longmaxi Formation is dominated by carbonaceous shale. The main mineral composition of the reservoir is quartz, with an average content of 58.66%, followed by clay minerals. The overall brittle mineral content is high, which is 77.19% on an average in the first member of Longmaxi Formation, and shows a significantly lower content in the upper part than that in the lower part. There are multiple reservoir space types in the high-quality shale interval in Wufeng-Longmaxi Formation, mainly including organic pores, inorganic pores and micro fractures. The average measured porosity is 3.46%, and the average permeability is 0.0022 mD, which show a medium-low porosity and ultra-low permeability reservoir. The shale is mainly Type Ⅰ organic matter and high maturity. The total organic carbon content is 4.58% and the total gas content is 4.85 m³/t. The further analysis shows that, in Anchang syncline in northern Guizhou, the favorable oxygen-poor to anoxic sedimentary environment during the deposition period of Wufeng-Longmaxi Formation laid the foundation for organic matter enrichment, a large number of organic matter pores provided a guarantee for reservoir development, and the good preservation conditions played a key role in shale gas accumulation and enrichment. The pressure coefficient is the decisive factor for shale gas production.

中图分类号:

TE112.23

李龙, 吴松, 李刚权, 王胜建, 薛宗安, 孟祥龙. 黔北地区安场向斜常压页岩气储层特征与主控因素[J]. 中国石油勘探, 2024, 29(2): 58-69.

Li Long, Wu Song, Li Gangquan, Wang Shengjian, Xue Zong’an, Meng Xianglong. Characteristics and main controlling factors for normal pressure shale gas reservoir in Anchang syncline in northern Guizhou[J]. China Petroleum Exploration, 2024, 29(2): 58-69.

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