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二连盆地高力罕凹陷下白垩统地层勘探程度低,储层成岩作用等内容研究相对薄弱,在一定程度上制约了该区下一步有利储层的优选。本文通过薄片鉴定、扫描电镜、粘土矿物X衍射等方法对高力罕凹陷下白垩统碎屑岩所经历的成岩作用类型及其对储层物性的控制作用进行了深入研究。结果表明,研究区成岩作用类型主要包括压实作用、胶结作用、交代作用以及溶解作用等。其中压实作用、胶结作用以及交代作用均属于破坏性成岩作用,而溶解作用属于建设性成岩作用。压实作用是使储层物性变差的根本原因,碳酸盐矿物、粘土矿物以及硅质的胶结作用使储层物性进一步变差,而溶解作用是改善研究区储层物性主要的成岩作用类型,但发育程度相对较低。
The lower Cretaceous strata exploration and the diagenesis of the reservoirs in the Erlian Sag in the Erlian Basin are relatively weak, which to a certain extent restricted the optimization of favorable reservoirs in this area. In this paper, the types of diagenesis experienced by the Lower Cretaceous clastic rocks in the Qili-Li Sag and their controlling effects on the reservoir physical properties are studied by means of thin-slice identification, scanning electron microscopy and X-ray diffraction of clay minerals. The results show that the types of diagenesis in the study area mainly include compaction, cementation, metasomatism and dissolution. Among them, compaction, cementation and metasomatism are both destructive diagenesis, whereas dissolution is a constructive diagenesis. Compaction is the basic reason for the deterioration of reservoir physical properties. The cementation of carbonate minerals, clay minerals and siliceous materials further deteriorates the reservoir physical properties, while dissolution is the main type of diagenesis to improve reservoir physical properties in the study area , But the development is relatively low.