High-precision inversion method for deep-water turbidite sandstone reservoir under complex fracture system

Abstract

The invention relates to a high-precision inversion method for a deep-water turbidite sandstone reservoir under a complex fracture system. The high-precision inversion method comprises the following steps that 1, a three-dimensional fault framework model is established according to fault interpreting data; 2, a three-dimensional horizon framework model is established according to seismic horizon interpreting data; 3, the development sequence of a fault and a horizon is judged according to tectonic evolution characteristics and geological prior information, the space truncation relation of thefault and the horizon is defined on the basis, and the three-dimensional fault framework model obtained in the step 1 and the three-dimensional horizon framework model obtained in the step 2 are combined to obtain a high-precision three-dimensional seismic formation framework; 4, a 'multi-body phase controlled iteration method' is adopted to establish an inversive low-frequency model; 5, iterativeoptimization is conducted on the prestack inversion process until an inversion result meets the requirement that space errors and loss functions are minimum, and a final inversion result is output.

Description

technical field [0001] The invention relates to a high-precision reservoir inversion method, in particular to a high-precision inversion method for deep-water turbidite sandstone reservoirs under complex fault systems. Background technique [0002] Deep-water turbidity flow sedimentary reservoir oilfields have become the source of increasing oil reserves and production in the world today. This type of reservoir is a typical gravity flow deposition, with sudden changes in the lateral direction of the reservoir, multi-stage vertical superposition, frequent migration and swing, and difficulty in finely characterizing the reservoir big. Coupled with the well-developed fault system in the structure, multi-phase faults cut each other, and the combination relationship is complex, how to finely describe the deep-water turbidite sandstone reservoir under this complex fault system is the key link to ensure the subsequent oilfield development and production. [0003] Due to the sudden...

AI Technical Summary

Problems solved by technology

However, for deep-water turbidite sandstone reservoirs under complex fault systems, the above technologies do not provide a complete solution

Images