Research On Reservoir Characteristics Of Huoshiling Formation-Yingcheng Formation In Wangfu Depression

Wangfu area has the history of exploration and development of many years,but the purpose layers are the Huoshiling volcanic rocks in the early time, but inrecent years，the clastic reservoirs has got good gas shows. Based on the extensivecollection of previous data, through the of the study of characteristics of the reservoirrock，reservoir diagenesis, pore structure and the type and reservoir properties，research and reservoir heterogeneity of Huoshiling-Yingcheng reservoir,to explorethe purpose reservoir characteristics and laws of the research and development areaand the main factors of controlling reservoir,and finally generalize the study arealongitudinal favorable reservoirs,horizontal distribution.To provide a scientific basisfor accurately calculating the preferred sub-region town of oil and selecting gasreserves,favorable reservoir blocks.Based on the exploration deployment requirements, Huoshiling-Yingchengof this rift will be divided into six sedimentary units, combined with logging, logging,drilling, seismic data and the analysis of test data，deposition characteristics of targetlayer were studied. The results show that in Huoshiling, Shahezi, YingchengFormation，three main facies types are identified, namely fan delta, lakes and lakefan, and further divided into three kinds of sedimentary facies,15kinds ofsedimentary microfacies. From bottom to top developmental semi-deep lake-fandelta-Sedimentary system, semi-deep lake-fan-delta system and the shallow lake-fan delta-Sedimentary system. Through the study of the area， the rock types of Huoshiling-Yingchengformation reservoir are mainly lithic feldspathic sandstone and feldspathic lithicsandstone.Compaction, cementation and accountable and dissolution of threereservoir diagenesis properties affected. In the study area, natively grain porositydevelopment is very rarel, narrow intergranular porosity development more widely,while the grain dissolution pores followed. According to Di Shi Xiang pore structureclassification scheme, the pore structure of the reservoir is divided into type Ⅰ,Ⅱ,grade Ⅲ, and only Ⅲ levelare discovered in the purpose formation.Incomparison, Huoshiling formation had good reservoir properties,and Shahezi andYingcheng formation come second. The infiltration characteristics hole researchshows that and Yingcheng and Shahezi formation are main reservoir for the speciallow porosity and low permeability; Huoshiling formation reservoir mainly low-especially low porosity and low permeability. The purpose study area has a stronginner layer,inter layer and plane heterogeneity, the causes is sedimentaryenvironment and diagenesis combined effects.According to reservoir properties ofplane distribution characteristics, the most favorable target layer reservoir distributionin this area is selected.