吐哈盆地台北凹陷深层致密砂岩气成藏特征及跃探1H井勘探发现的意义

doi:10.3969/j.issn.1672-7703.2024.06.001

摘要/Abstract

摘要： 吐哈盆地台北凹陷跃探1H 井首次在小草湖洼陷下侏罗统八道湾组获得勘探发现，从而实现了台北凹陷次级洼陷区勘探的全面突破，揭示了整个台北凹陷区致密砂岩气良好的勘探前景。立足台北凹陷，从深层致密砂岩气形成的地质条件开展综合分析认为：（1）台北凹陷水西沟群发育的八道湾组、三工河组和中侏罗统西山窑组3 套烃源岩为致密砂岩气提供了充足的物质基础；（2）发育三角洲前缘规模砂体以及近煤层砂岩溶蚀孔，是深层致密气聚集的有利储集体；（3）位于走滑冲断带下部的地层保存条件好，是致密砂岩气富集的有利区。同时，基于跃探1H井勘探发现，明确了小草湖洼陷的优势成藏条件，进而重新认识整个台北凹陷致密气发育的有利地质条件：（1）洼陷中心区发育有效砂体；（2）南物源砂体储层物性更优；（3）更高成熟度的烃源岩发育区是天然气有利富集带。重新评价台北凹陷致密砂岩气资源量，预测致密砂岩气资源量为7070×10⁸m³，较前期有了明显提升。综合评价优选出小草湖洼陷东北部和胜北洼陷北部两个致密砂岩气有利勘探领域。

关键词: 吐哈盆地, 台北凹陷, 中—下侏罗统, 深层, 致密砂岩气, 资源量, 小草湖洼陷

Abstract: Well Yuetan 1H in the Taipei Sag of the Tuha Basin made the first exploration discovery in the Badaowan Formation of the Xiaocaohu sub-sag, which achieved a comprehensive breakthrough in the exploration of the secondary sag area of the Taipei Sag and revealed the good exploration prospect of tight sandstone gas in the entire Taipei Sag area. Based on the Taipei Sag, this paper comprehensively analyzes the geological conditions of deep tight sandstone gas formation, and concludes that: (1) the development of three sets of source rocks in the Shuixigou Group provides a sufficient material basis for tight sandstone gas; (2) The development of delta front-scale sand bodies and near-coal seam sandstone dissolution pores are favorable reservoirs for deep tight gas accumulation; (3) The strata located in the lower part of the strike-slip thrust zone have good preservation conditions, which is a favorable area for tight sandstone gas enrichment. At the same time,based on the geological information obtained from the exploration and discovery of Well Yuetan 1H, the dominant accumulation conditions of Xiaocaohu sub-sag were clarified, and then the favorable geological conditions of tight gas in the entire Taipei Sag were re-understood, and it was pointed out that: (1) effective sand bodies were developed in the central area of the sub-sag; (2) The physical properties of the reservoir of the southern source sand body are better; (3) The source rock development zone with higher maturity is a favorable zone for natural gas enrichment. Based on the latest geological information and understanding, the evaluation of tight gas resources in Taipei Sag was re-carried out, and the predicted tight sandstone gas resources were 7070×10⁸m³, which was significantly higher than that in the previous period. Finally, the comprehensive evaluation selects two favorable exploration areas of tight sandstone gas in the northeast of Xiaocaohu sub-sag and north of Shengbei sub-sag.

Key words: Tuha Basin, Taipei sag, Middle-Lower Jurassic, Deep, Tight sandstone gas, Amount of resources, Xiaocaohu sub-sag

中图分类号:

TE122.1

陈旋, 刘俊田, 张华, 林潼, 苟红光, 程祎, 郭森. 吐哈盆地台北凹陷深层致密砂岩气成藏特征及跃探1H井勘探发现的意义[J]. 中国石油勘探, 2024, 29(6): 1-16.

Chen Xuan, Liu Juntian, Zhang Hua, Lin Tong, Gou Hongguang, Cheng Yi, Guo Sen. Accumulation Conditions of Deep tight sandstone Gas in Taipei Sag and Enlightenment and Significance of Exploration and Discovery of Yuetan 1H Well[J]. China Petroleum Exploration, 2024, 29(6): 1-16.

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