Multiscale core-seismic analysis for karst characterisation of MX field, Central Luconia Province, Offshore Sarawak, Malaysia.

S. Rahman, M. Husen, Grisel Jimenez Soto, S. B. Bing, M. Poppelreiter, N. Jamin, R. Rosli
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Abstract

In the Oil and Gas industry, carbonate reservoirs play an important role in holding most of the world’s hydrocarbon reserves. They account for 60% of the world’s oil and 40% of the world’s gas reserves. Nonetheless, carbonate reservoirs continue to pose challenges due to their multi-scale heterogeneities from depositional and post-depositional physical and chemical diagenetic processes that alter the rock’s structure, affecting its porosity and permeability. The Middle Miocene Central Luconia province located in offshore Sarawak has received much attention since its discovery by Shell as one of Malaysia’s largest gas fields in 1971. Over 250 carbonate build-ups occur offshore in the Central Luconia province. Around 60 platforms have been drilled and almost every field has encountered indications for high permeability zones likely associated with karst such as mud losses and drill bit drops during drilling activities. Some fields were left abandoned due to the mud losses that could not be controlled. Geometries, distribution, and the dimension of karst in Central Luconia fields remain unknown. They have not been studied in detail. Due to the current lack of understanding of karst morphology, a regional integrated study has been initiated in this research to establish a systematic multidisciplinary approach and acquire detailed geological understanding from one-dimensional to three-dimensional aspects. The heterogeneity of carbonate reservoirs arises from the differences of porosity/permeability, which are marked, by diagenetic overprint and/or meteoric dissolution resulting in Reservoir Rock Types (RRTs) with different petrophysical properties (Jimenez et al., 2020).
马来西亚沙捞越海上Luconia省MX油田岩溶特征的多尺度岩心-地震分析。
在油气工业中,碳酸盐岩储层占据着世界上大部分油气储量的重要地位。它们占世界石油储量的60%,占世界天然气储量的40%。尽管如此,由于沉积和沉积后物理和化学成岩过程的多尺度非均质性改变了岩石的结构,影响了其孔隙度和渗透率,碳酸盐岩储层仍然面临着挑战。位于沙捞越海上的中中新世中央卢科尼亚省自1971年被壳牌公司发现以来,一直受到广泛关注,成为马来西亚最大的天然气田之一。在中卢科尼亚省近海有250多个碳酸盐岩堆积。大约有60个钻井平台,几乎每个油田都遇到了可能与喀斯特有关的高渗透区域的迹象,例如钻井活动期间的泥浆损失和钻头掉落。由于泥浆流失无法控制,一些田地被遗弃了。在卢科尼亚中部地区,喀斯特的几何形状、分布和规模仍然未知。它们还没有被详细研究过。由于目前对喀斯特地貌的认识不足,本研究启动了区域一体化研究,建立了系统的多学科方法,从一维到三维方面获得详细的地质认识。碳酸盐岩储层的非均质性源于孔隙度/渗透率的差异,这种差异通过成岩叠印和/或大气溶蚀来标志,从而导致具有不同岩石物理性质的储层岩石类型(RRTs) (Jimenez et al., 2020)。
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