Evaluation Of The Reservoi～forming Conditions Of Shale Gas Potential Of The UPPer Paleozoie In Eastern Ordos Basi

Exploration practice shows that forming shale gas reservoirs is strongly affected by burial depth, thickness, the content of organic carbon,matter type of organic、mineral composition,porosity, permeability, fracture and shale gas. In this paper based on researching results of previous studies and finishing with a large number of geochemistry, rock mineral core samples of measured data and other related information, analyzing shale gas reservoir formation in the study area conditions:Ordos Basin upper paleozoic shale deposition and distribution characteristics. Upper Palaeozoic a transitional fades, Continental coal source rocks of Erdos Basin Eastern, the sedimentary thickness is larger, Overall shale thickness generally>40m; Organic carbon content is high, generally TOC>2.0%; The mainlytype of organic matter are type Ⅱ and type Ⅲ kerogen,it’s high thermal evolution degree, Ro subject between1.2%～2%, most of the area is mature and highly mature stage; Clay is Rich in shale, it contents high Quartz feldspar and other brittle mineral, the average value of brittle mineral is29.6%; Pore and fracture system is developed, providing good reservoir for the formation of shale gas; In mud shale the adsorption quantity and the organic carbon content and stress was positively related by isothermal adsorption experiments. Finnaly, I think good conditions are concluded for forming shale gas reservoir,predicted Shanxi formation is the most favorable horizon for shale gas accumulation and Shenmu-Tahe-Shuangshan area is the most favorable zone of shale gas reservoirs.