黔北地区安页1井下志留统松坎组天然气成因

doi:10.11743/ogg20180301

Abstract

Abstract: The Well Anye(AY)1 of north Guizhou,in the Sichuan Basin,is a shale gas well of major breakthrough in oil and gas exploration of the basin.The Lower Silurian Songkan Formation of this well has good resources of potential of oil and gas.To better understand the genesis of natural gas in the gas reservoir of the formation,we distinguished the Lower Silurian Songkan and Shiniulan Formation in the area,and made a series of experiments in geochemistry,gas composition,gas isotopes.The experimental results show that(1)under special lithologial combinations,the average content of TOC of the Songkan Formation in this area is 0.16%,the R_o value varies from 2.75% to 2.92% with the average of 2.95%,and the kerogen type is mainly Type Ⅱ;meanwhile its gas accumulation is dominated by methane(over 96%),plus a small amount of ethane,propane,and other hydrocarbon gases;(2)the natural gas drying coefficient of the Songkan Formation in the study area is much smaller than that of the Wufeng-Longmaxi Formation,and the CO₂ content of the Xintan Formation is significantly higher than that of the Songkan and Wufeng-Longmaxi Formation;(3)the δ¹³C₁ value of gas isotopes in the Songkan Formation ranges from -33.2‰ to -33.9‰,with the average of -33.5‰;δ¹³C₂ value is in the range between -36.5‰ and -37.0‰,and the average is -36.8‰,while the δD(CH₄) value is within the range between -145.8‰ and -156.6‰,averaging at -150.0‰,and the kerogen carbon isotope value in the formation is from -32.9‰ to -32.6‰,with the average of -32.75‰.Combining CO₂ tracer gas migration theory,gas drying coefficient and gas source correlation characteristics,we conclude that the natural gas of the Songkan Formation strata from Well AY1 is mainly derived from the formation's mudstone shale gas after heat cracking.

Key words: gas drying coefficient, CO₂ tracer gas migration, gas source correlation, Well AY1, shale gas, Songkan Formation, north Guizhou

CLC Number:

TE122.1

Zhang Jinchuan, Lei Huaiyu, Zhang Fu, Li Long, Liu Ziyi, Liu Yang, Zhang Peng. Origin of on natural gas in the Lower Silurian Songkan Formation from Well Anye 1,north Guizhou area[J]. Oil & Gas Geology, 2018, 39(3): 419-428.

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Origin of on natural gas in the Lower Silurian Songkan Formation from Well Anye 1,north Guizhou area

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