Structural Characteristics Analysis And Reservoir Prediction Study In The Northern Area Of DMT Depression

The Liaohe fault depression is developed above the Liaohe Basin.In the north,there is a primary structural unit with an area of about 800 km2,which is the DMT depression in the three major depressions in the area.The depression is 62 km in the longitudinal direction and 10-20 km in the lateral direction.It is a Mesozoic and Cenozoic continental depression.The basement consists of granite,gneiss and carbonates from the Archean and Upper Mesoproterozoic,respectively.Because it is located in the Liaohe depression,it has fault distribution in the eastern and southern parts of the east.This paper mainly studies the northern part of DMT Sag,with an exploration area of about 300 km~2.By carefully studying the logging,drilling and seismic data of the work area,the strata are divided into the third member of the Shahe Formation in the work area.The LandMark software is used to make a synthetic record of 40 wells in the work area,and the area is analyzed according to the VSP data of the existing well.The upper speed variation law and the quality of the acoustic wave time difference curve of each well are accurately calibrated.Using three-dimensional visualization technology,coherent slicing technology to interpret faults,and to understand the distribution characteristics of distribution rules,according to the results of structural interpretation,combined with the research results of predecessors,the DMT depression is divided into nine three-level structural belts.Based on the analysis of seismic attributes,the reservoir prediction inversion is performed by using Jason software.In this process,the reservoir characteristics of the sandstone and the reservoir characteristics of the buried hill are analyzed respectively.The results show that the reservoir is well developed.Especially in the third member of Sha 3,the reservoir is the most developed,and the rest of the Sha 3 and Sha 3 sections.In general,the reservoir development of the Sha 3 member is relatively poor.Finally,this paper summarizes the hydrocarbon accumulation rules in the region,conducts comprehensive geological analysis of the entire area,and evaluates the favorable exploration areas,providing a reliable theoretical basis for future well placement and exploration and development work.