Prediction method of compact transition rock reservoir stratum

Abstract

The invention relates to a prediction method of a compact transition rock and relates to the technical field of oil development reservoir engineering. The method comprises the following steps of (1) model forward modeling, wherein fine level calibration is carried out, a compact transition rock section and a sand rock section single well are subjected to model forward modeling, and the earthquake response characteristic difference of a sand rock and the compact transition rock is analyzed; (2) conventional seismic attribution extracting, wherein for a target level, stratum attributions comprising amplitude and frequency are extracted through a conventional seismic attribution extracting method; (3) attribution optimization, wherein the seismic attributions high in reaction lithology difference, namely earthquake amplitude and frequency attributions are optimized, and attribution preprocessing is carried out; and (4) attribution fusion, wherein the earthquake amplitude and the frequency attributions are used, attribution fusion formula selecting is carried out, advantage attributions are expanded, disadvantage attributions are suppressed, and distribution of a compact oil reservoir stratum is detected. According to the prediction method, a large amount of seismic attribution information is fused, the earthquake response features of the sand rock and the transition rock can be distinguished, and the space distribution of the compact transition rock can be predicted effectively.

Description

technical field [0001] The invention relates to the technical field of oil development reservoir engineering, more specifically, the invention relates to a method for predicting tight transitional rock reservoirs. Background technique [0002] At present, tight oil has become a new bright spot in global unconventional oil exploration, especially in North America; my country has made major discoveries in tight sandstone oil in recent years, and it is widely distributed in Songliao, Ordos, Sichuan Basin and other places, showing huge potential for exploitation. Dagang Oilfield has also been discovered, but the overall exploration and development and related research are still in the preparation stage. [0003] The delta sand bodies are distributed in rings along the edge of the lake basin, the low slope of the paleo lake basin - the delta front sheet sand in the central area, the far-shore subaqueous fan sand bodies and tight transitional rocks and other tight reservoirs and or...

AI Technical Summary

Problems solved by technology

In the past, the seismic response characteristics of sandstone and tight transitional rocks were not clear, and conventional seismic attributes could not predict tight transitional rocks. The prediction of tight oil distribution in sags mainly used geology, drilling, logging, and mud logging to determine favorable zones. Limited by the distribution of the drilling plane

Therefore, the prediction of the spatial distribution of tight transitional rocks requires the use of seismic prediction methods, and seismic attribute prediction is one of the methods. However, conventional single seismic attribute analysis is difficult to distinguish between sandstone interbeds and tight transitional rock reservoirs. A Multi-Seismic Attribute Fusion Earthquake Prediction Method for Tight Transitional Rocks

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