准噶尔盆地阜康凹陷二叠系上乌尔禾组油气勘探突破与启示

doi:10.7657/XJPG20240202

摘要/Abstract

摘要：

准噶尔盆地阜康凹陷康探1井区二叠系上乌尔禾组亿吨级储量的落实，展现了阜康凹陷深层油气良好的成藏条件和巨大的勘探潜力。为总结阜康凹陷上乌尔禾组的勘探经验与理论认识，指导其他富烃凹陷碎屑岩领域下凹勘探，依托井资料、储集层岩石薄片、孔渗分析以及试油资料等，对阜康凹陷上乌尔禾组下凹勘探突破进行系统分析。阜康凹陷周缘凸起带和斜坡区油气主体为烃源岩成熟阶段早期的产物，烃源岩高熟油气主要富集在凹陷区；阜康凹陷上乌尔禾组受沉积期古地貌的控制，发育退覆式沉积低位域砂体，形成了古凹槽区叠置连片规模储集体；凹陷区普遍存在超压，有利于深埋砂岩原生孔隙的保存，还有助于微裂缝的形成，提高储集层渗流能力，增加深埋储集层的有效性。阜康凹陷上乌尔禾组受到芦草沟组烃源岩晚期高熟油气的充注、退覆式沉积的规模成砂以及超压作用的保孔增渗，具备规模增储的勘探潜力。

关键词: 准噶尔盆地, 阜康凹陷, 二叠系, 上乌尔禾组, 勘探启示, 退覆式沉积

Abstract:

The confirmation of 100-million-ton reserves in the Permian upper Wuerhe formation in the Kangtan-1 well area of Fukang sag, Junggar basin, demonstrates the excellent hydrocarbon accumulation conditions and huge exploration potential of the deep layers in the sag. Summarizing the exploration experience and theoretical understanding of the upper Wuerhe formation in the Fukang sag will be significant to guide the exploration of clastic reservoirs in other hydrocarbon-rich sags. Using the data of drilling, reservoir rock thin section, porosity-permeability analysis and formation testing, a systematic analysis was conducted on the exploration breakthrough of the upper Wuerhe formation in the Fukang sag. It is indicated that the oil and gas in the uplift and slope zones around the Fukang sag are mainly products of source rocks in the early maturity stage, and the hydrocarbons generated in the high maturity stage of source rocks are mainly found in the sag area. Controlled by the paleogeomorphology during deposition, retrogradational sand bodies in lowstand systems tract （LST） were developed in the upper Wuerhe formation in the Fukang sag, forming superimposed continuous large-scale reservoirs in the paleo-trough area. Overpressure is commonly found in the sag, which is conducive to the preservation of primary pores in deeply buried sandstones and also to the formation of microfractures, enhancing the permeability of reservoirs and making the deep reservoirs more effective. The upper Wuerhe formation in the Fukang sag has large exploration potential for achieving reserves increment due to the late-stage charging of hydrocarbons generated from highly mature sources rocks in the Lucaogou formation, the large-scale retrograditional sedimentation, and the pore preservation and permeability increasement caused by overpressure.

Key words: Junggar basin, Fukang sag, Permian, upper Wuerhe formation, exploration implication, retrogradational sedimentation

中图分类号:

TE122

刘超威, 李辉, 王泽胜, 王秋玉, 谢知益, 黄志强, 张蓉. 准噶尔盆地阜康凹陷二叠系上乌尔禾组油气勘探突破与启示[J]. 新疆石油地质, 2024, 45(2): 139-150.

LIU Chaowei, LI Hui, WANG Zesheng, WANG Qiuyu, XIE Zhiyi, HUANG Zhiqiang, ZHANG Rong. Breakthrough and Implication of Oil and Gas Exploration in Permian Upper Wuerhe Formation in Fukang Sag, Junggar Basin[J]. Xinjiang Petroleum Geology, 2024, 45(2): 139-150.

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