Study on Huoshiling Stage-Yingcheng Stage sedimentary micro-facies and reservoir recognition in Shiwu fault depression
Liu Peng-bo1,2, Pu Ren-hai1,2, Liu Juan-xia2
1. State Key Lab of Continental Dynamics of Northwest University, Xi'an City, Shanxi Province, 710069, China;
2. Department of Geology of Northwest University, Xi'an City, Shanxi Province, 710069, China;
3. Research Institute of Exploration and Development, Dagang Oilfield, Tianjing City, 300280, China
Abstract:It is considered by analyzing cores,logging data and sedimentary micro-facies from more than 20 wells such as LS1 and SN10 et al and seismic facies from 740km2 area of 3D fine seismic data that there is well-developed semi-deep-deep lake facies in upper segment of Yingcheng Stage,Shahezi Stage and Huoshiling Stage in deep of Shiwu fault depression.Two different kinds of seismic reflectance signature and distribution all appear in lake-facies mudstone and reservoir sandstone along with the difference of depths and horizons.The reservoir sandstone is mainly fan delta distributary channel and turbidite fan sheet sand,in which the distribution of fan delta is mainly in northern,northeastern and southeastern parts of fault depression laterally and in Yingcheng Stage vertically,forming strong reflections because of lower velocity of interfacial semi-deep-deep lake facies mudstone;the distribution of sandstone is fan-like and branch-like channel composition or linear single channel laterally,forming mid-to-weak reflections.The distribution of turbidite fan is mainly around the deep depression in the southern part of fault depression laterally and in upper part of Shahezi Stage and Huoshiling Stage vertically.The mudstone in upper or lower turbidite fan is characterized by larger thickness and single lithology forms a large set of reflections with weak amplitude or reflection-free,the turbidite fan sand body is characterized by thin and mid-to-strong foreset reflections and the composition of foreset body is multi-stage lobes.The source area of fan delta and turbidite fan comes from northern,northeastern and southeastern parts of fault depression.The deep hydrocarbon show is very popular,and these results of reservoir recognition and prediction have important meaning for looking for larger-scale gas reservoir in the region.
刘朋波, 蒲仁海, 刘娟霞. 十屋断陷火石岭组—营城组沉积微相研究与储层识别[J]. 石油地球物理勘探, 2009, 44(3): 347-353.
LIU Peng-Bo, PU Ren-Hai, LIU Juan-Xia. Study on Huoshiling Stage-Yingcheng Stage sedimentary micro-facies and reservoir recognition in Shiwu fault depression. OGP, 2009, 44(3): 347-353.