Sedimentary Microfacies And Single Sand Bodies Characterization Of Chang6 In The Southwestern Part Of Wanggoumen Block

As the blood of modern industry and the material foundation of modern civilization,petroleum has become a trend that cannot be ignored for its refined exploration and development.Therefore,this paper applies sedimentology,tectonic geology,sequence stratigraphy,logging geology and other methods,and investigates a large number of previous achievements,collects logging data and geological data of 180 wells in this study area.The Chang 6 in the southwestern part of the Wanggoumen block was studied in detail.The analysis suggests that:?1?The Chang 6 reservoir group in the study area can be divided into three small layers of Chang 6₁,Chang 6₂,and Chang 6₃,of which Chang 6₁ is about 44-47m thick,Chang 6₂ is about41-43m thick,and Chang 6₃ is about 44-47m thick.The thickness difference of the small strata is small.?2?The structure is simple,the whole shows a weak trend of low in the west and high in the east,and a nasal structure develops.?3?By observing the core color,structure etc,combined with the previous summary,and the shape of the log curve,it is considered that the sedimentary environment of the Chang 6 oil layer in the study area is the delta front subfacies,and the main type of microfacies is water Lower diversion channel,estuary dam and diversion bay.Among them,the Chang 6₁ diversion channel has the most development,the sand body thickness is the highest and the connectivity is the best;Chang 6₂ and Chang 6₃ mostly develop the diversion bays,containing a small number of estuary dams,compared with less sand body content and poor connectivity.?4?After the single sand body is identified by the vertical identification mark and the horizontal identification mark,the contact relationship is determined.The research found that it is mainly divided into single sand body of underwater distributary channel and single sand body of estuary dam.In the single sand body profile distribution diagram,it can be found that most wells in the cross section along the provenance direction are relatively continuous in the lateral sand body,while most wells in the vertical provenance direction are relatively continuous in the lateral direction.In addition,the thickness and connectivity of the single sand body in Chang 6₁are better than that of Chang 6₂ and Chang 6₃.Therefore,this paper believes that Chang 6₁ in the study area is the favorable zone for the best reservoir.