동해 울릉분지 UBGH2-6 하이드레이트 지층 및 포화율 분포 특성을 고려한 시뮬레이션 연구
Simulation Study on UBGH2-6 Deposit in the Ulleung Basin Considering Hydrate Bearing Sediments and Saturation Distribution Characteristics
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본 연구에서는 동해 울릉분지 UBGH2-6의 세부지층모델을 기반으로 불균질 하이드레이트 포화율을 갖는 저류층 기본모델을 구축하였다. 감압법 적용 결과, 누적 가스 생산량의 74.6%가 하이드레이트 포화율이 낮은 박층(0.2 m 이하)에 편중되었다. 하이드레이트 포화율과 박층 구조가 가스 생산에 미치는 영향을 분석하기 위해 저류층 시뮬레이션을 수행하였다. 하이드레이트 포화율이 균질한 모델에서는 포화율이 감소함에 따라 유효 투과도가 증가하여 모든 사질에서 가스 생산이 발생하였다. 다양한 박층 분포 시나리오에 따른 분석 결과, 두께가 0.1 m인 박층을 기본모델에서 삭제하면 누적 가스 생산량이 40%까지 감소하였으며, 박층의 분포범위가 길어질수록 공저압 영향반경을증가시켜 하이드레이트 해리면 전파가 확장되었다. 박층에서의 가스생산량 비중을 고려하였을 때, UBGH2-6 가스하이드레이트 생산 전략 수립에 있어 생산 목표층으로의 박층에 대한 보다 세밀한 규명이 필요함을 알 수 있다.
Abstract
Reservoir simulation models with a heterogeneous distribution of hydrate saturation were built based on the complex geology model of the UBGH2-6 deposit in the Ulleung Basin, Korea. Because of the hydrate production by the depressurization method, 74.6% of the cumulative gas production was produced from a thin layer (less than 0.2 m) with low hydrate saturation. A reservoir simulation was performed to evaluate the effect of hydrate saturation and thin-layer structure on gas production. In the case of homogeneous distribution of hydrate saturation, the gas can be produced from all sand layers because of the increasing effective permeability with decreasing hydrate saturation. Production analysis based on various thin layer structures revealed a decrease in the cumulative gas production by 40% after removal of a thin layer with thickness of 0.1 m from the base model. As the radius of the thin layer increases, the hydrate dissociation front can be propagated more by increasing the influence radius of the bottomhole pressure. Considering the proportion of gas production in the thin layers, a detailed investigation of thin layers as the production target is required to establish a strategy for gas hydrate production in the UBGH2-6 deposit.
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