Formation Mechanism of Cretaceous-Paleogene Abnormal Pressure in Dabei Area of Kuqa Depression, Tarim Basin

Abstract

Abstract: The Dabei area of Kuqa depression is an abnormal pressure well developing zone in Tarim basin. The abnormal pressure encountered by drilling occurs from the Paleogene to the Cretaceous as key strata. The detecting the abnormal pressure distribution characteristics of Paleogene-Cretaceous suggests that the tensile stress effect formed by South Tianshan tectonic movement and the developed salt rock in the key strata are two important factors for forming such an abnormal pressure in this area. Combining geological structure feature with the lithologic composition of the key strata in Kelasu structural belt, this paper presents the detailed analysis of the formation mechanism of the two great factors, respectively.

Key words: Kuqa Dabei area, Cretaceous, Paleocene, Neocene, abnormal pressure, formation mechanism, tectonic stress, salt rock

CLC Number:

TE112.23

TANG Shou-bao, GAO Feng, FAN Hong-hai, YE Zhi, JIA Li-qiang. Formation Mechanism of Cretaceous-Paleogene Abnormal Pressure in Dabei Area of Kuqa Depression, Tarim Basin[J]. Xinjiang Petroleum Geology, 2011, 32(4): 370-372.

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Formation Mechanism of Cretaceous-Paleogene Abnormal Pressure in Dabei Area of Kuqa Depression, Tarim Basin

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