Abstract
The Chang 6 reservoir in Hulangmao area is a lithologic reservoir controlled by Zhidan Jingbian delta depositional system in Northern Shanxi Province. The oil reservoir has entered the middle-high-water-cut stage. The reservoir is characterized by low porosity and low permeability, with strong heterogeneity and great development difficulty. Therefore, it is necessary to further study the distribution of remaining oil through fine single sand body division and correlation，so as to improve the level of the reservoir development. Based on the theory of high-resolution sequence stratigraphy, according to the characteristics of mudstone marker bed and logging combinations, the sedimentary cycles are studied by using the techniques of maximum entropy spectrum and wavelet transform, and the cycle characteristics of different levels are clarified. Chang 6 member is divided into 3 fourth-level cycles, 6 fifth-level cycles (small levels), 13 sixth-order cycles (single level), and 21 seventh-order cycles (single sand body). Based on the stratigraphic correlation analysis model of sand body equal thickness, channel down-cutting, lateral phase transformation and splitting of superimposed sand body, and combined with the core and logging characteristics of the target area, the correlation framework of single sand layer in the whole area is established.
Highlights
The Chang 6 reservoir in Hulangmao area is characterized by poor physical properties and strong heterogeneity, and the development of multi-layer system has resulted in prominent inter layer contradictions
The so-called maximum entropy spectrum analysis mainly refers to the method of extrapolation operation and obtaining the relevant autocorrelation function according to the principle of maximum entropy
The difference between the specific value and the estimated value of maximum entropy spectrum analysis is the prediction error, from which we can obtain a theoretical reference for the receding lake: when the value is positive, it means that the predicted value is smaller than the actual measured value
Summary
The Chang 6 reservoir in Hulangmao area is characterized by poor physical properties and strong heterogeneity, and the development of multi-layer system has resulted in prominent inter layer contradictions. It is urgent to make a detailed and systematic distinction and comparison of single layer in Hulanglao Chang 6 reservoir. With the help of maximum entropy spectrum analysis and wavelet analysis, the paper adopts the technical means of "dividing layers by analysis attributes, determining interface between core and logging, and dividing correlation into small layers", so as to realize the identification, differentiation and comparison of base-level cycle sequences in the study area. Based on the identification of logging facies, the fine division of single sand body is carried out in the target horizon of Chang 612 to Chang 622. Yan Yunbiao et al.: Fine Single Sand Body Characterization of Hulangmao Chang 6 Reservoir in Jing'an Oilfield of single sand layer in Chang 6 member of Hulanglao is created
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