Liaohe Oil Field Gao 3-6-18 Block Lotus Oil Reservoir Characteristics Research

After many years of research,the lotus oil layer in the Gao 3-6-18 block of Liaohe Oilfield has entered the stage of high water cut later stage,and the distribution of remaining oil is more complicated.In this paper,sedimentary petrology,structural geology and well logging interpretation are applied to the above problems.Based on the theory,based on the sedimentary model of the nearshore subaqueous fan,the fine sand structure of the reservoir is analyzed,and two sedimentary microfacies between the braided channel and the braided channel are identified and passed.Finely describe and characterize small layers and single sand bodies to improve understanding of reservoirs.Through the core data of the core of the area,the lithology of the L5 and L6 sand bodies of the lotus oil layer,sandstone composition,structure,grain size,sedimentary structure and other data are compared with the previous sedimentary features of the area,and the sand body is measured.Well curve response and distribution,the results show that there are two major phases,two subphases and two microphases in the target area.According to the sedimentary background,the lotus oil layer is mainly deposited as a nearshore subaqueous fan,the transition part is the lake phase and the subphase is divided into the middle fan and the front fan subphase.The microphase contained in this area is the middle fan subphase subdivision.The micro-phase between the braided channel and the braided channel;the reservoir rock type is mainly conglomerate,gravel sandstone,the porosity of L5 sand body is slightly better than L6;the diagenesis is mainly mechanical compaction,L5 The diagenesis of the sand body is weaker than that of the L6 sand body;the profile of the sand body is distributed in the southeast direction of the source,and the section is mainly controlled by the single sand body of the river.There will be a large number of well connected wells,and most of the small layer internal transverse sand The body is continuously connected and has a wide range and exists in most of the horizons.The wells in the direction of the vertical source are weakened by the cross-cut source,and the control of the single sand body is weakened,resulting in some small layers being discontinuous and the lateral connectivity being poor.