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Paleo-karst and Distribution of Oil and Gas of Lower Ordovician in Akekule Area , Tarim Basin

Qiang Chen

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Abstract

Lower Ordovician carbonate rock is the major reservoir in Akekule area of Tarim Basin, and karst is the most important factor influencing Ordovician reservoir. The authors point out that karst in the study area is paleo supergene karst mainly controlled by fresh water karst and with multi stage features. The development depth is restricted by waterproof stratum of Silurian Devonian and Upper Ordovician rocks. We also suppose out that the surface of karst zone and upper phreatic karst zone in karst slope unit is favorable reservoir and enrichment region of oil and gas.

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What this paper is about

Lower Ordovician carbonate rock is the major reservoir in Akekule area of Tarim Basin, and karst is the most important factor influencing Ordovician reservoir. The authors point out that karst in the study area is paleo supergene karst mainly controlled by fresh water karst and with multi stage features. The development depth is restricted by waterproof stratum of Silurian Devonian and Upper Ordovician rocks. We also suppose out that the surface of karst zone and upper phreatic karst zone in karst slope unit is favorable reservoir and enrichment region of oil and gas.

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Available abstract

Lower Ordovician carbonate rock is the major reservoir in Akekule area of Tarim Basin, and karst is the most important factor influencing Ordovician reservoir. The authors point out that karst in the study area is paleo supergene karst mainly controlled by fresh water karst and with multi stage features. The development depth is restricted by waterproof stratum of Silurian Devonian and Upper Ordovician rocks. We also suppose out that the surface of karst zone and upper phreatic karst zone in karst slope unit is favorable reservoir and enrichment region of oil and gas.

Key concepts: Karst, Ordovician, Geology, Tarim basin, Carbonate rock, Stratum, Devonian, Paleozoic

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