Received date: 2009-04-08
Revised date: 2009-04-29
Online published: 2009-06-10
Qishen 1 well is a deep exploratory well that is located in the Binhai fault nose of the Qikou sag in the Huanghua depression, Bohai Bay Basin. The well section in depth of 4 823.0~5 088 m was tested and produced 54 611 m3/d gas by a 10.32 mm nozzle tip. Carbon isotope values of the natural gas are abnormally heavy: δ13C1 is between -35.7 ‰~-32.7 ‰, δ13C2 is between -19.1‰~-15.2 ‰. Based on the integrated study of the carbon isotope value and light hydrocarbon composition of pyrolysis gas from the Es3 source rock, the gas composition, light hydrocarbon composition and carbon isotope value of natural gas and the characteristics of reservoir inclusions, it is considered that the natural gas of Qishen1 is a high maturity gas, mainly from the deeper Es3 source rock with several injection periods. This understanding proves the existence of high\|over mature natural gas in the Qikou sag and identifies Es2 and Es3 as the deep gas exploration prospects.
GUO Jian-Yang, XU Hua-Min, LI Jian, WANG Dong-Liang, CUI Hui-Yang, LI Zhi-Sheng . Gas Source of Qishen-1 Well in Qikou Sag[J]. Natural Gas Geoscience, 2009 , 20(3) : 392 -399 . DOI: 10.11764/j.issn.1672-1926.2009.03.392
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