准噶尔盆地南缘清水河组储集层特征及其主控因素

doi:10.7657/XJPG20200106

摘要/Abstract

摘要：

准噶尔盆地南缘四棵树凹陷白垩系清水河组底部砂岩储集层获得了日产千方的高产油气流,证明该套储集层是一套优质储集层。在对多条露头剖面和多口钻井资料分析基础上,利用偏光显微镜、孔渗分析仪、激光共聚焦显微镜等实验仪器,对清水河组砂岩样品开展了岩石矿物、物性、孔隙结构等方面的分析,并结合埋藏史开展成岩演化研究。结果表明,研究区清水河组砂岩主要为长石岩屑砂岩和岩屑砂岩,储集层杂基含量不高,胶结物含量中等,剩余粒间孔发育;清水河组砂岩储集层处于中成岩阶段A期,压实作用是主要减孔作用。综合分析认为,清水河组优质储集层的形成受控于早期长期浅埋晚期快速深埋、裂缝发育以及地层异常高压3个关键因素,早期长期浅埋晚期快速深埋的埋藏方式有助于储集层原生孔隙的保存;粒内微裂缝和层理缝共同发育有助于砂岩储集层中高效渗流通道的形成;地层异常高压有助于粒间孔的保存及裂缝的开启。

关键词: 准噶尔盆地, 白垩系, 清水河组, 储集层特征, 主控因素, 成岩演化, 异常高压, 埋藏史

Abstract:

Profitable oil and gas flows of over 1,000 m ³/d have been obtained from the sandstone reservoir of the Cretaceous Qingshuihe formation in the Sikeshu sag of the southern margin, Junggar basin, which proves that the formation belongs to a set of high-quality reservoir. Based on the analysis of outcrop sections and drilling data and using polarizing microscope, pore and permeability analyzer and confocal laser scanning microscope, the paper analyzes the rock mineral, physical property and pore structure of the sandstone samples from the Qingshuihe formation and carries out researches on diagenetic evolution by combining with its burial history. The results show that the sandstone of Qingshuihe formation mainly containing feldspar lithic sandstone and lithic sandstone is characterized by a little matrix, medium content of cements and developed residual intergranular pores, which is at the Phase A of the middle diagenetic stage with the compaction dominated by pore reduction. The comprehensive analysis shows that the formation of the high-quality reservoir in Qingshuihe formation is controlled by 3 key factors such as early long-term shallow burial and late rapid deep burial, developed fractures and abnormal high formation pressure. The early long-term shallow burial and the late rapid deep burial are favorable for preservation of primary pores in the reservoir; both intragranular microfracture and bedding fracture are developed, which is helpful for the formation of efficient flowing paths in the sandstone reservoir; and the abnormal high formation pressure contributes to the preservation of intergranular pores and the opening of fractures.

Key words: Junggar basin, Cretaceous, Qingshuihe formation, reservoir characteristic, main controlling factor, diagenetic evoluation, abnor- mal high pressure, burial history

中图分类号:

TE112.24

司学强, 袁波, 郭华军, 徐洋, 陈能贵, 彭博. 准噶尔盆地南缘清水河组储集层特征及其主控因素[J]. 新疆石油地质, 2020, 41(1): 38-45.

SI Xueqiang, YUAN Bo, GUO Huajun, XU Yang, CHEN Nenggui, PENG Bo. Reservoir Characteristics and Main Controlling Factors of Cretaceous Qingshuihe Formation in the Southern Margin of Junggar Basin[J]. Xinjiang Petroleum Geology, 2020, 41(1): 38-45.

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