Abstract
Fracture-pore complexes, located at fault zones of Darriwilian carbonates, are the main exploration targets in the Shunbei area, Tarim Basin. This article focuses on the carbonate characteristics in the Lower Ordovician of Well ShunbeiPeng1 (SHBP1), the carbonate is sandwiched by two trending NW-SE deep-seated, strike-slip faults in the Shuntuoguole uplift. Based on detailed core investigation and careful petrographic examination, two main reservoir types, denoting microquartz and dolomite, are recognized. The former is mainly constrained in the lower part of the sampled core and gradually evolves to the latter with progressively decreases of silica. Integrated isotopic geochemistry (C, O, and Sr) and fluid inclusion microthermometry suggest that the fluids are hydrothermal origin and migrate along deep-seated strike-slip faults, forming favorable carbonate reservoirs. The fault-controlled hydrothermal reservoirs, characterized by the strong amplitude in the seismic profile, would be the most promising exploration area in deeply buried carbonates in the Tarim Basin, particularly in the Shuntuoguole area.
Highlights
The lower Paleozoic carbonate rocks, located at the Tarim Basin, contain abundant oil and gas resources and are the main targets for hydrocarbon exploration in the future [1, 2–6]
It is urgent to perform investigations to reveal the inherent characteristics of ultradeeply buried carbonate reservoirs in Tarim Basin
A series of deep-seated and strike-slip faults, which intersect the strata from the crystalline basement through the Upper Ordovician Yijianfang Formation, are present in the Shuntuoguole uplift [7, 8, 19, 20]
Summary
The lower Paleozoic carbonate rocks, located at the Tarim Basin, contain abundant oil and gas resources and are the main targets for hydrocarbon exploration in the future [1, 2–6]. In light of abnormal beaded reflectors, the high-quality reservoirs may exist in the deep-buried geological layers, ranging from Florian to Dapingian successions [9, 17, 18]. These reservoirs have not yet been detailed studied, due to the scarcity of the drilling core dataset. Current investigation, upon Shunbei Yingshan Formation, is greatly limited as a result of low exploration and well coring data, it is hard to judge the siliceous metasomatism of reservoirs, its function to transform the spatial distribution characteristics, and its scale. This research will provide reference for future oil and gas exploration of deep-buried carbonate reservoirs
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