Origin and accumulation of natural gas in the Carboniferous carbonate in the buried hill A area, Weixinan Depression, Beibu Gulf Basin

IF 4.2 3区 工程技术 Q2 ENERGY & FUELS
Yufei Gao, Congkai Niu, Yaqing Wang, Tianyou Zhang, Yixuan Zhang
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Abstract

Buried hills constitute a significant oil and gas exploration area in the Weixinan Depression. The A area is a typical buried hill, and carbonate hills are considered major reservoir reserves with rich resources. Geochemical, core observation, microsection, and drilling data have been extracted to study the tectonic control factor of the carbonate buried hill reservoir from the A area in the Weixinan Depression. The results indicate that the carbonate buried hill in the study area mainly consists of karst reservoirs, which are divided from top to bottom into the epikarst, vertical percolate-corrosion, runoff corrosion, and phreatic corrosion zones. The epikarst zone and runoff corrosion zone exhibit the best reservoir physical properties among all zones. The natural gas in the reservoir producing oil-related gas, staying in mature stage without experiencing secondary modification effects. Through a comparison of carbon isotope and parameters of light hydrocarbon, the natural gases can be deemed to probably be sourced from the oil shale of the middle of the Liushagang Formation in an adjacent depression. The fault was connected the source rocks and reservoirs, which were active during the early Holocene to early Miocene. Meanwhile, the oil shale in the middle Liushagang Formation was in the mature stage, resulting in the expulsion of natural gases. Multistage tectonic uplift has subjected the buried hill to long-term weathering and leaching, leading to the formation of storage space. Additionally, secondary development and optimal fault opening positions provide favorable migration conditions for hydrocarbon to accumulate in buried-hill reservoirs.
潜山是渭西南坳陷重要的油气勘探区。A地区为典型的潜山,碳酸盐岩丘陵被认为是油气资源丰富的主要储层。利用地球化学、岩心观测、显微剖面和钻井等资料,研究了渭西南坳陷A区碳酸盐岩潜山储层的构造控制因素。结果表明:研究区碳酸盐岩潜山以岩溶储层为主,从上到下可划分为表溶蚀带、垂向渗透腐蚀带、径流腐蚀带和潜水腐蚀带;表溶带和径流腐蚀带的储层物性最好。产油伴生气的储层中的天然气,处于成熟阶段,未发生二次改性作用。通过碳同位素和轻烃参数对比,认为天然气可能来源于邻近凹陷的柳沙岗组中部油页岩。断裂连接了早全新世至早中新世活动的烃源岩和储层。同时,中六沙岗组油页岩处于成熟阶段,导致天然气排出。多期构造隆升使潜山长期风化淋滤,形成储集空间。此外,二次发育和最佳断裂张开位置为潜山油气藏的成藏提供了有利的运移条件。
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来源期刊
Natural Gas Industry B
Natural Gas Industry B Earth and Planetary Sciences-Geology
CiteScore
5.80
自引率
6.10%
发文量
46
审稿时长
79 days
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