3차원 분리균열모델 기반의 유동모델링 연구동향
Research Review of Flow Modeling based on 3D Discrete Fracture Networks
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초록
분리균열모델은 시추공 조사에서 획득한 균열의 분포, 간극자료를 활용할 수 있어 균열저류층 유동모델링에 폭 넓게 적용되고 있다. 3차원 분리균열모델 기반 저류층 모델링의 대표적인 문제점은 1차원 코어자료를 3차원 공간에 분포시키면서 발생하는 정적자료의 부족과 부정확성이다. 그 결과 시추공 주변 균열대의 유체 거동분석은 가능하지만 저류층 단위의 유동모사에는 제한적이다. 현재 3차원 분리균열모델 기반 저류층 모델링은 격자화, 다공성 암체-균열 사이의 물질이동, 역산기법의 미개발 등의 기법적 한계에 직면하고 있다. 최근 딜로니 삼각형법, 자동사각격자법을 이용한 격자화가 이루어지면서 전위모델링은 활발하나 현장단위 물질이동의 해석해, 역산모델 개발은 미흡하다. 향후 연구주제로는 무작위 균열모델의 균열-암체 격자화, 다상유체 거동해석, 동적자료 기반의 히스토리매칭, 석유-암반공학 통합 저류층 모델링을 대표적으로 제안할 수 있다.
Abstract
Discrete fracture network (DFN) has been widely applied to characterize fluid flow occurred in a heterogeneous fractured reservoir since it is able to consider fracture’s topological distribution as well as aperture statistics. A typical limitation of reservoir characterization using 3D DFN is that it is difficult to obtain accurate geological and hydraulic data affecting fluid transport. Thus, the modeling failed to simulate realistic flow in a reservoir scale and limited at observing fluid transport near wellbore. Current methodological problems of 3D random DFN are meshing, mass transfer between matrix and fracture, and inverse approach, respectively. They have not been announced actively in opposite to the researches based on forward simulation. The future possible researches can be related to automatic meshing in random DFN, multi-phase flow modeling, history matching incorporating with dynamic data, and flow transport integrated with geomechanic characteristics.
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