Study On The Characteristics Carbonate Reservoir Of Ordovician's Yinmaill Of West Part Of Tarim Baisin

The Tarim basin is one of the most important areas with rich hydrocarbon resources in the western part of our country, while YingMaiLi is one of the low-leveled areas of hydrocarbon exploration in the Tarim basin. So it is necessary to do some effective work on reservoir evaluation of hydrocarbon resources in this area. This research aims at systematical research on Cambrian and Ordovician carbonate sedimentary facies and reservoir characteristics of YingMaiLi in Tarim basin in order to inquire forming conditions and distributive rules and supply the forecast of profitable reservoir areas with scientific foundation by using sequence stratigraphical, sedimentological, seismogeological and reservoir geological theories, methods and techniques.Firstly,We use the views of sequence straigphy ,the data of outcrop section ,drill core and logging,to plot out sequence of single well section. Furthermore we can set up the sequence of strata of YingShan and YiJianFan. YingShang group is devided into five parsequence;YiJianFan group is devided into two parsequence. It has been discovered that there are restricted platform facie ,furthermore recongnized ntra-platform shoals subfacie and beach terrace lagoon subfacieSecondly, we investigated pore types, pore characteristics, reservoir physical properties and types of carbonate in YingMaiLi and analysed master controlling factors of reservoir types by research on drills'reservoir petrology and physical properties which are combined with controlling factors of carbonate reservoir types. Then we evaluate and forecast Ordovician carbonate reservoir qulity in YingMaiLi by combining reservoir characteristics and distributive characteristics of sedimentary facies.Finally,in summary, we can find that there are relatively poor conditions to develop high-grade carbonate reservoirs in YingMaiLi, while intensive denudation and growing of structural bracks can greatly improve physical properties of reservoir in this area. In addition, reservoir is controlled by four grade offing drop forms.This is cause that reservoir is appeared the top or middle of parasequence. There is a profitable reservoir belt in intra-platform shoals subfacie, especially the line of well YM2-YM206-YM201-YM202, it has well foreground of oil exploitation.