Syprideis Breaking-Out Point and Determination of Upper Youshashan Formation Bottom Boundary in Qaidam Basin

Abstract

Abstract: Based on the principle of biogenetic isochronism, new boundary between Upper and Lower Y oushashan formations in Fengxi structure of Qaidam basin is presented. Using this principle for correlation of G-5 Well in Honggouzi structure, the Lower Ganchaigou formation at depth of about 4 000 m in this well should be classified into the Upper Ganchaigou formation. By strata correlation of microfossils from cutting logging, Cyprideis abundance curve is plotted and new method for strata correlation through identification of Cyprideis breaking-out point is proposed.

Key words: Pliocene, Cyprideis, Upper Youshashan formation, bio-explosion, Ostracoda, Qaidam basin

CLC Number:

Q915
TE111.3

LU Yan-li, ZHANG Hai-quan, QIAO Zi-zhen. Syprideis Breaking-Out Point and Determination of Upper Youshashan Formation Bottom Boundary in Qaidam Basin[J]. Xinjiang Petroleum Geology, 2005, 26(4): 462-464.

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Syprideis Breaking-Out Point and Determination of Upper Youshashan Formation Bottom Boundary in Qaidam Basin

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