Abstract
The Gucheng region is oil and gas accumulation area of Tarim Basin，dominated by beach controlled lithologic oil and gas reservoirs，which has superior oil and gas accumulation conditions and broad exploration prospects. The lower Paleozoic strata in the Gucheng region are the Carboniferous, Ordovician, and Cambrian systems from top to bottom. The Silurian, Devonian, and Permian systems are missing. The lower Ordovician – Cambrian are the main exploration target layers in the area. There are four reservoirs: the Ordovician group, the Yingshan group, the Penglaiba group and the Cambrian group in The Gucheng region, The upper part of the Yijianfang formation and Yingshan formation are limestone reservoir, which is a set of potential reservoir. The lower part of the Yingshan formation, the Penglaiba formation, and the Cambrian formation developed three sets of dolomite reservoirs. The distribution of oil and gas in Gucheng region was mainly found in Yijianfang formation, Yingshan formation, Penglaiba formation and Cambrian of the Ordovician. The Yingshan group and the Hanwu group were the main exploration target layers. Yingshan formation and Cambrian are the main exploration targets, and Yijianfang formation and Penglaiba formation of Ordovician can be used as the concurrent exploration targets. Gucheng region can form two major realistic exploration areas: dolomite reservoir of Ordovician and reef beach of Cambrian. The Ordovician dolomite reservoirs are mainly searched for the inner shoal of the platform edge high-energy facies belt, and the Cambrian system is mainly search for the high-energy reef beach far away from the platform edge facies belt in the north of cherchen fault.
Highlights
The marine sedimentary basins in China were mainly developed in the Paleozoic Era and contained abundant oil and gas resources [1,2,3,4]
The rules of hydrocarbon accumulation and enrichment are very complicated, which affect the breakthrough in the oil and gas exploration of China's marine carbonate reservoirs
There are three sets of dolomite reservoirs developed in the lower part of Yingshan Formation, Penglaiba Formation and Cambrian, with powdery, fine and medium-coarse crystal dolomites, among which fine-medium-coarse crystal dolomites form favorable reservoirs
Summary
The marine sedimentary basins in China were mainly developed in the Paleozoic Era and contained abundant oil and gas resources [1,2,3,4]. The rules of hydrocarbon accumulation and enrichment are very complicated, which affect the breakthrough in the oil and gas exploration of China's marine carbonate reservoirs. The Gucheng area has a favorable structural location, well-developed carbonate reservoirs and favorable accumulation conditions. It has the petroleum geological conditions for the formation of large-medium-sized oil and gas fields. It has large exploration potential and abundant resources. A number of research results have been obtained by researchers on the oil and gas accumulation conditions in the adjacent Tazhong area [10,11,12,13,14], but the current exploration level in the Gucheng.
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