大牛地奥陶系马五段岩溶白云岩储层主控因素

发布时间：2018-04-21 01:06

本文选题：大牛地 + 马五段　；参考：《西南石油大学学报(自然科学版)》2017年03期

【摘要】：针对鄂尔多斯盆地大牛地气田马五段储层成因的多样性,开展对岩溶白云岩储层主控因素的研究。通过岩芯、薄片观察及物性分析,明确了白云岩储层岩石学、储集空间及物性特征,并在此基础上利用测井,建立储层的识别标准。通过测井解释,运用风化壳残余厚度图和连井剖面,解释白云岩储层的主控因素,最后认为:(1)岩溶微古地貌沟槽溶蚀作用极为强烈,多发育溶蚀垮塌角砾岩,储层发育极差;岩溶高地储层相对较好;(2)岩性的差异导致白云岩储层溶蚀程度的强弱,膏质白云岩边溶蚀边垮塌,横向上延伸范围较广,垂向上可形成较深的垮塌,加剧了岩溶发育程度,含极少膏质白云岩容易发育溶孔及裂缝,有利储层发育;(3)不同白云石化作用造成储层的非均质性,准同生期发育的泥晶白云岩较为致密,粉一细晶白云岩孔隙较为发育,且两者互层分布使得储层纵向上变化较大,但横向上较为连续。
[Abstract]:In view of the diversity of reservoir genesis in the fifth member of Daniudi gas field in Ordos Basin, the main controlling factors of karst dolomite reservoir are studied. Through core, thin slice observation and physical property analysis, the petrology, reservoir space and physical properties of dolomite reservoir are defined, and on the basis of this, the identification standard of reservoir is established by using well logging. The main controlling factors of dolomite reservoir are explained by using the residual thickness map of weathering crust and multi-well section through logging interpretation. Finally, it is considered that the dissolution of karst micropaleogeomorphic trench is extremely strong, and the dissolution collapse breccia is often developed and the reservoir is extremely poor. The difference in lithology of karst highland reservoir leads to the dissolution degree of dolomite reservoir, the dissolution and collapse of gypsum dolomite, the wide range of horizontal extension, and the deep collapse in vertical direction, which intensifies the karst development. It is easy to develop dissolved pores and fractures in dolomite containing very few gypsum, which is favorable for reservoir development. (3) the heterogeneity of reservoir is caused by different dolomitization, and the mud-crystal dolomite developed in quasi-syntectic stage is relatively dense, and the pores of silt-fine-grained dolomite are relatively developed. And the distribution of the interbedded layers makes the reservoir change more vertically, but more continuously laterally.
【作者单位】：中国石油西南油气田分公司勘探开发研究院;西南石油大学地球科学与技术学院;成都理工大学能源学院;
【基金】：国家科技重大专项(2011ZX04045)
【分类号】：P618.13

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