Occurrences of the Natural Gas in Shahejie Formation of Qikou Depressionin Bohai Bay Basin and Its Exploration Significance
Received date: 2013-05-02
Revised date: 2013-06-20
Online published: 2014-05-10
Abundant natural gas reservoirs with burial depth >3 500 m have been found recently in the Shahejie Formation of the Qikou Depression.The natural gas reservoirs were distributed linearly along the faults and were featured by hybrid gas-oil-water relationships,which were widely recognized in unconventional hydrocarbon reservoirs.In order to understand the occurrence of natural gas in geological conditions for guiding further exploration，this paper calculated the content of gas component dissolved in the crude oil and formation water,affected by temperature,pressure,crude oil property,water salinity,and then compared with the oil production and natural gas output.Most natural gases of Shahejie reservoirs dissolved in the oil and water have been saturated to supersaturation,which formed the hybrid gas-oil-water relationship of free gas in deep transition to shallow of dissolved gas in oil reservoirs or a small amount of free gas,and those reservoirs linearly along those fault which connect with the gas source can be rich in free gas.Meanwhile,the paper discussed the pattern of the oil and gas migration and accumulation after analysis of the occurrences of the natural gas and the distribution of the gas and oil reservoirs.The areas in shallow linearly along those deep faults connecting oil and gas source are benefit to search of condensate gas reservoirs or pure gas reservoirs,in the middle-deep layers for the existence of oil-generating window with the huge quantities of crude oil being better to look for oil reservoirs or dissolved gas-oil reservoirs or light oil reservoirs,and in deep the concomitant fracture traps are easy to enrich the free gas and form the condensate gas reservoirs and the pure gas reservoirs.
LONG Hua-shan,XIANG Cai-fu,NIU Jia-yu,LI Hong-xiang,WEI Li-chun,HAN Guo-meng,JIANG Fu-jie . Occurrences of the Natural Gas in Shahejie Formation of Qikou Depressionin Bohai Bay Basin and Its Exploration Significance[J]. Natural Gas Geoscience, 2014 , 25(5) : 665 -678 . DOI: 10.11764/j.issn.1672-1926.2014.05.665
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