Study On Distribution Regularity And Controlling Factors Of The First Member Of The Shahejie Formation In Boxing Sag

Boxing Depression is one of the most western secondary tectonic units in dongying sag in the jiyang depression,and it has been found that there are many oil-bearing strata in Shahejie formation and Dongying group.A sand is an important oil-bearing series in the study area,has now found a variety of types of reservoir,and sand a buried shallow,high capacity and good efficiency characteristics,is an important basis of next step.A deposit for rural part in sand and know the problem of low degree of main control factors,the study of comprehensive utilization of well drilling,well logging,seismic and other related data,the sequence stratigraphy,sedimentology,reservoir geology,under the guidance of theoretical methods,such as set up rural part in a sequence stratigraphic framework,has been clear about the types of sedimentary system and distribution,depositional model is established,to guide rural part in sand reservoir exploration and development to provide geological basis for a while.The following points have been achieved:?1?A study of the stratigraphic framework of the Es₁ formation was carried out by comprehensively using logging data,seismic data,and well logging data.The Shahejie Formation in the Boxing Sag was divided into two upper and lower sections of Es₁,and Sand1 in the Boxing Depression.The upper sub-segment mainly develops the lake retreat system,while the sand sub-segment mainly develops the lake-wide system tract.?2?Through the observation of the core,the phase signs were analyzed and the sedimentary facies and sedimentary characteristics of the Es₁ Formation were determined.It was considered that the Shajie Formation mainly developed braided river deltas,fan deltas,and lake equivalent sedimentary types;In the well phase study,a core log is used to establish the correspondence between the log response and the phase sequence of the core,and the phase pattern is established.Finally,according to seismic phase parameters such as the internal reflection structure and external shape of the earthquake,the type of seismic facies is determined.The distribution rule establishes the relationship between the seismic facies,the core facies,and the well logging facies,transforms the seismic facies into sedimentary facies,and determines the type of sedimentary facies in the Es₁ Member of the Boxing Depression through a comprehensive study of core,facies,and seismic facies.It is believed that four types of sedimentary facies,such as braided river delta,shallow water delta,fan delta,and lake,were developed in the Shayi Formation of the Boxing Sag.The distribution law of the sedimentary system was clarified and it was assumed that the water was still in the water during the initial sedimentation of Shahejie Formation in the Shahejie Formation.The shallower stage is dominated by the inherited shallow water delta and fan delta sediments;Developmental beach bar.?3?In the final comprehensive depositional system study,the relationship between the type of sedimentary system and the sandbody morphology was determined to determine the distribution of favorable sandbodies.It was considered that the underwater distributary channel sandbodies and estuaries of the Sha-1 delta front in the Boxing depression Sand dams,beach-bar sand bodies,and tip-out sand bodies at the front of the fan delta can all be important reservoir sand bodies,providing a theoretical basis for exploration and deployment.