Seismic Facies Analysis And Reservoir Prediction Of The Jialingjiang Formation In The Southeastern Sichuan Basin

In order to further accelerate the exploration process of favorable reservoirs in southeastern Sichuan,this paper selects the dominant reservoir area: Qijiang block in southeastern Sichuan.Based on the outcrop observation,logging and seismic data,the Jialingjiang Formation of this block is based on the theory of sedimentary petrology,seismic stratigraphy and correlation analysis.The seismic facies analysis and reservoir prediction of the Jialingjiang Formation in the Qijiang block of the southeastern Sichuan area are carried out.Based on this,the favorable reservoir zone is divided and the reservoir zone is evaluated.The findings are as follows:(1)The sedimentary facies analysis of the target strata is carried out by collecting rock samples and drilling,logging data,combined with sedimentology and sequence stratigraphy.The sedimentary environment was analyzed,and the sedimentary model was established.The sedimentary facies of the single well was characterized by the sedimentary facies.The sedimentary facies of the Jialingjiang Formation in the study area are carbonate sedimentary facies and are divided into four subfacies and six microfacies.(2)Synthetic seismic records combined with the theory of seismic stratigraphy to explain the seismic section,seismic section and logging data combined to divide the seismic facies.The study area is divided into four seismic facies,Class ? top and bottom are mainly white reflection,occasionally the top of the intermittent reflex,the top of the class ? is a single phase,weak amplitude,continuous continuous surface reflection,the main For the blank reflection,local discontinuous weak reflection,class ?,the top of the biphase,more continuous seat reflection,local intermittent reflection,the internal blank reflection,IV class high frequency,3-4 phase,weak-strong amplitude,continuous continuous seat reflection.(3)According to the logging and seismic response characteristics,to determine the local seismic anomalies.The Jialingjiang Formation in the western part of the study area developed more pre-product,and the former product was accompanied by partial anomalies such as waviness,short axis and star point.The deposition of mud in the northeastern direction is aggravated.(4)Analyze the logging and drilling data,combined with the characteristics and data of Jialingjiang Formation,according to the characteristics of seismic wave group and wave impedance analysis,the phased analysis of the target layer is carried out,and the main reservoir Velocity and the main frequency of the wavelet,to predict the favorable correlation between the sedimentary facies.And the sedimentary facies distribution,the successful division of the favorable reservoir phase.(5)Based on the above results,six reservoirs of Jialingjiang Formation in the Qijiang area of southeastern Sichuan were obtained,among which,there were 1 class ?,3 class ? and 2 class 2.