南黄海盆地中央隆起石炭系—早二叠世多孔碳酸盐储层非均质分布及油气潜力分析

IF 4.6 3区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
China Geology Pub Date : 2025-01-25 DOI:10.31035/cg2023059
Shu-yu Wu , Jun Liu , Jian-wen Chen , Qi-liang Sun , Yin-guo Zhang , Jie Liang , Yong-cai Feng
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引用次数: 0

摘要

中-古生界海相碳酸盐岩是南黄海盆地中央隆起区重要的油气储集层。由于井眼稀少,碳酸盐岩储层非均质性显著,碳酸盐岩多孔储层的分布及其关键控制因素尚不清楚。通过地震反演和同位素分析,探讨了影响SYSB地区石炭系—早二叠世多孔碳酸盐岩储层分布的因素。提取并分析了多孔碳酸盐储层的测井地震特征、敏感岩性参数和物性参数。应用叠前同步反演技术对多孔碳酸盐岩储层进行了岩性和物性预测。此外,用碳、氧、锶同位素分析了碳酸盐岩的沉积特征。结果表明:多孔碳酸盐储层主要发育在孔隙度为3% ~ 5%的开阔台地沉积中,主要分布在古高原(黄龙组和船山组)和古高原斜坡(贺州组)。栖霞组碳酸盐岩多孔储层仅在局部发育。此外,负δ13C偏移表明研究区石炭世至早二叠世为温暖湿润的热带气候,并伴有3次海平面波动。多孔碳酸盐岩发育的有利条件包括沉积环境和成岩作用。原生孔隙在古高原高能量环境下形成,次生孔隙在同生或准同生时期通过溶蚀作用增加。油气潜力分析认为,晚奥陶统五峰组和下志留统高家边组是高成熟—过成熟阶段的烃源岩,石炭统—下二叠统碳酸盐岩是良好的储集层,晚二叠统龙潭—大隆组是稳定的封盖层,保证了SYSB巨大的成藏潜力。本研究方法可应用于全球其他碳酸盐岩为主地层。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Carboniferous-Early Permian heterogeneous distribution of porous carbonate reservoirs in the Central Uplift of the South Yellow Sea Basin and its hydrocarbon potential analysis
Mesozoic-Palaeozoic marine carbonate rocks are crucial hydrocarbon reservoirs in the Central Uplift area of the South Yellow Sea Basin (SYSB). Due to the scarcity of boreholes and the significant heterogeneity of carbonate reservoirs, the distribution of porous carbonate reservoirs and their related key controlling factors remain unclear. In this study, factors affecting the distribution of porous Carboniferous-Early Permian carbonate reservoirs in the SYSB were investigated through seismic inversion and isotope analysis. The log-seismic characteristics of porous carbonate reservoirs, sensitive lithology parameters, and physical property parameters were extracted and analyzed. The pre-stack simultaneous inversion technique was applied to predict the lithology and physical properties of porous carbonate reservoirs. Moreover, the sedimentary of carbonate was analyzed using isotopes of carbon, oxygen, and strontium. The results show that porous carbonate reservoirs are mainly developed in the open platform sediments with porosities of 3%–5% and are mainly distributed in the paleo-highland (Huanglong Formation and Chuanshan Formation) and the slope of paleo-highland (Hezhou Formation). The porous carbonate reservoirs of the Qixia Formation are only locally developed. In addition, the negative δ13C excursions indicate a warm and humid tropical climate with three sea-level fluctuations in the study area from the Carboniferous to Early Permian. The favorable conditions for developing porous carbonate rocks include the sedimentary environment and diagenetic process. The primary pore tends to form in high-energy environments of the paleo-highland, and the secondary pore is increased by dissolution during the syngenetic or quasi-syngenetic period. According to the hydrocarbon potential analysis, the Late Ordovician Wufeng Formation and Lower Silurian Gaojiabian Formation are the source rocks in the high-maturity-over-maturity stage, the Carboniferous-Lower Permian carbonate is the good reservoirs, and the Late Permian Longtan-Dalong Formation is the stable seal, ensuring a huge hydrocarbon accumulation potential in SYSB. The methods proposed in this study can be applied to other carbonate-dominated strata worldwide.
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来源期刊
China Geology
China Geology GEOLOGY-
CiteScore
7.80
自引率
11.10%
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275
审稿时长
16 weeks
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