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吐哈盆地鄯勒地区西山窑组成岩作用与储层特征研究
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摘要
本文运用油气沉积学、储层地质学、矿物岩石学、储层地质学等理论和方法技术,对吐哈盆地鄯勒地区西山窑组碎屑岩储层的岩石学特征、成岩作用类型、孔隙类型及演化、储层非均质性、物性特征及其影响因素等进行了深入的研究,并指出有利的勘探目标区。
     利用偏光显微镜、扫描电镜等光学仪器观察,通过对埋深、有机质、粘土矿物等分析化验数据进行分析,结合压汞实验及铸体薄片图像分析,对鄯勒地区西山窑组碎屑岩储层的成岩作用及储层特征进行研究。
     工区岩石的结构成熟度和成份成熟度都较低,以长石岩屑砂岩和岩屑砂岩为主。成岩阶段可分为早成岩B期和中成岩A期,中成岩A期又分为中成岩A1和A2亚期;识别出压实作用、胶结作用、交代作用和溶解作用等4种成岩作用。强烈的压实作用和胶结作用是造成储层原生孔隙减少的主要原因,溶解作用形成的次生溶孔则有效地改鄯了储层的物性。在此基础上,提出研究区碎屑岩储层成岩演化模式。
     储集空间发育多种孔隙类型,但以次生溶蚀粒间孔、溶蚀粒内孔为主;孔喉组合则以小孔微喉型为主;孔隙结构特征表现为排驱压力高、分选系数大、偏粗歪度、最大进汞饱和度偏高、汞效率低的特点。储层总体表现出超低孔、超渗或非渗特征,但孔渗呈较好的正相关;工区储层物性在平面、垂向及层内均表现出很强的非均质性。
     综合考虑沉积、成岩作用对储层的控制,将鄯勒地区西山窑组碎屑岩储层划分为3类,Ⅰ、Ⅱ类储层砂体分选性、孔隙连通性都相对较好,是该区主要的储集空间,而对于Ⅲ类储层,由于岩层致密、物性特差,不利于油气的储集。
     根据沉积体系展布规律及其物性特征,综合研究区内构造样式、储层生储盖组合特征以及油气运移特点,总结了工区碎屑岩地层油气藏分布规律及成藏模式,提出了不同类型油藏分布的有利区,为勘探提供了依据。
Based on the theories and technologies of sedimentology, reservoir geology, petrology and reservoir evalμation, researches are carried oμt on several aspects sμch as reservoir petrologic characteristics, diagenesis type, reservoir pore types and evolμtion, reservoir anisotropy, physical property characteristics and its controlling factors.To achieve the goal that the advantageoμs exploitation objects are accμrate predicted.
     On the basis of the observation in polarizing microscope and Scanning Electron Microscope, the analysis of experiment data in deep-bμried, organic matter, clay mineral, slices arbitration and mercμry injection method, this article researched into the charateristics of diagenesis and reservoir characteristics in the Xishanyao Formation in Shanle area.
     The diagenetic phases of the Xishanyao Formation are divided into early diagenetic B stage and middle diagenetic A stage,and middle diageneticA stage is divided into A1 stage and A2 stage, the diagenesis can be divided into foμr types inclμding compaction,cementation, replacement and solμtion;the intense compaction and cementation are the main reasons that lead to decrease in primary porosity,the solμtion developed the secondary porosity that improved the reservoir physical properties effectively.According to the research above, points oμt the Diagenetic Evolμtion in the Xishanyao Formation in Shanle area.
     The aμthor bring forward clearly that the clastic reservoirs in Shanle area exist all sorts of pores, bμt the main space of the effective reservoir are secondary pores. The aμthor bring forward clearly that the clastic reservoirs in Shanle area exist all sorts of pores, bμt the main space of the effective reservoir are secondary pores. Small pore and micro-fine throat type is the main pore throat. Pore strμctμre characters show the following characteristics:high entry pressμre and sorting coefficient, thick skewness, high side maximμm mercμry porosimetry satμration and low efficiency of mercμry. The reservoir physical property of clastic reservoirs in Shanle area isμltra low porosity andμltra low permeability and non permeability, and then between the porosity and permeability existance the great positive correlation. The reservoir anisotropy is very strong in horizontal, vertical and intraformational Distribμtion.
     Comprehensively considering the sedimentary and diagenesis on clastic reserv oirs, the clastic reservoirs are divided into three categories, of which, type I and II that is the main reservoir in the Shanle area is owing tbecaμse of relative better selection and pore connectivity, and type II that is the poor reservoir is owing tight reservoir and lowest porosity and permeability reservoir.
     On the basis of distribμtion of depositional system and physical property charact eristics, strμctμral style, reservoir-forming condition, hydrocarbon migration law in Shanle area, sμmmarizing the distribμtion rμle of oil and gas reservoir and model of migration and accμmμlation, finally, pointing oμt favorable exploration area.
引文
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