Paleogeomorphology Recovery and Reservoir Prediction of Upper Carboniferous in M Block,Pre-Caspian Basin
Miao Qianyou
Zhu Xiaomin
Li Guobin
Guo Hongming
Yang Qinlin
Zhang Jing
Zhang Yajun
Hong Liang
Abstract：The development of dolomite reservoirs is mainly influenced by primary sedimentary lithology and later dissolution action,whereas the primary sedimentary lithology is controlled by pre-depositional paleogeomorphology and the dissolution ac-tion is controlled by karst-geomorphology.In M Block,the favorable reservoir rock of KT-Ⅰ is dissolution dolomite and is dis-tributed in the upper formation,with its pore types mainly including intercrystalline pores,intercrystalline solution pores,in-tergranular solution pores and organic visceral pores.The paleogeomorphology in Carboniferous in M Block is featured with“higher in west and lower in east”and “lower in west and higher in east”in Early Permian,with the eroded top formation of KT-Ⅰ.This study applies residual thickness method and mould method for recovery of the pre-depositional paleogeomorpholo-gy and the karst-geomorphology respectively,and suggests the favorable area of dolomite reservoirs occurs in the overlap zone of the pre-depositional paleogeomorphology highland and karst-slope zone,and it is further suggested that exploration area for potential dolomite reservoirs is to be extended southward and eastward.Three appraisal wells in central-southern and southern areas yield good results.The study shows the paleogeomorphology recovery technique is effective for predicting dolomite reser-voir in M Block.
Keywords：dolomite reservoirpaleogeomorphology recoverypre-depositional paleogeomorphologykarst-geomorphologypre-Caspian basinpetroleum geology
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 871-879 )