准噶尔盆地莫索湾地区清水河组深层优质储层特征及其物性控制因素

发布时间：2018-03-02 15:33

本文选题：准噶尔盆地　切入点：莫索湾地区　出处：《吉林大学学报(地球科学版)》2017年04期 　论文类型：期刊论文

【摘要】：为了明确准噶尔盆地腹部莫索湾地区清水河组储层特征及其成因,综合利用铸体薄片、扫描电镜、物性、X衍射等多种分析测试手段,并结合钻测井、地层测试资料及区域埋藏史、古地温、沉积体系等相关研究成果,详细分析了清水河组储层成岩作用特征及其物性控制因素,并在此基础上总结成岩模式。研究结果表明:清水河组储层具有低成分成熟度、高塑性岩屑含量及高结构成熟度的"一低两高"特征;尽管储层主体埋深在3 500m以下,但储集空间仍以原生粒间孔为主,平均孔隙度为15.47%,平均渗透率可达226.6mD,为典型的深层优质储层;储层成岩作用总体表现为"中压实中强压实、强溶蚀、弱胶结"的特征,尽管储层埋深较大,但成岩阶段整体仍处于中成岩A1亚期;区域连片的厚层辫状河三角洲前缘水下分流河道及河口坝中细砂岩及中粗砂岩是形成深层优质储层的基础,而成岩过程中储层物性保存主要受控于早期碳酸盐胶结抗压实、绿泥石包壳及后期酸性成岩流体条件下的溶蚀增孔作用;除上述沉积、成岩控制因素外,地层超压的存在使得储层在深埋条件下压实强度显著降低,是储层物性保存的关键,同时在储层成岩演化过程中及现今盆地不断降低的地温梯度也有效延缓了储层的成岩进程。
[Abstract]:In order to clarify the reservoir characteristics and genesis of Qingshuihe formation in Mosuowan area in the abdomen of Junggar Basin, a variety of analytical and testing methods, such as casting sheet, scanning electron microscope, physical properties X-ray diffraction and well drilling, are used synthetically. The diagenesis characteristics of Qingshuihe formation reservoir and its physical controlling factors are analyzed in detail, including stratigraphic test data, regional burial history, paleogeothermal temperature, sedimentary system, and so on. On this basis, the diagenetic model is summarized. The results show that the reservoir of Qingshuihe formation has the characteristics of low composition maturity, high plastic cuttings content and high structural maturity, although the main reservoir is buried below 3 500 m deep. However, the reservoir space is still dominated by primary intergranular pores, with an average porosity of 15.47m and an average permeability of 226.6 mD.The reservoir diagenesis is characterized by "medium compaction, strong dissolution and weak cementation". Although the reservoir is buried deep, the diagenetic stage is still in the middle diagenetic A1 substage, the subaqueous distributary channel in the front edge of the thick braided river delta and the fine sandstone and the medium coarse sandstone in the estuarine dam are the basis for the formation of the deep and high quality reservoir. The preservation of reservoir physical properties during diagenesis is mainly controlled by the dissolution and pore enhancement under the conditions of early carbonate cementation and compaction, chlorite cladding and acid diagenetic fluid in the later period, except for the above-mentioned deposition, diagenesis controlling factors, The existence of formation overpressure makes the compaction strength of the reservoir decrease significantly under the condition of deep burial, which is the key of reservoir physical property preservation. Meanwhile, the decreasing geothermal gradient during the diagenetic evolution of the reservoir and in the present basin also effectively delays the diagenetic process of the reservoir.
【作者单位】：中国石油大学(北京)地球科学学院;中国石油大学(北京)油气资源与探测国家重点实验室;中国石油新疆油田分公司实验检测研究院;中石化重庆涪陵页岩气勘探开发有限公司;
【基金】：国家自然科学基金项目(41672098) 中国石油科技创新基金项目(2014D-5006-0101)~~
【分类号】：P618.13

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