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天然气既可来源于干酪根的裂解气 ,也可来源于原油的裂解气。对于腐泥型有机质 ,绝大部分天然气是来自源岩生成的原油裂解气 ,只有部分来自干酪根的裂解气 ,因此天然气气源研究不仅要指出来自哪套源岩 ,还需指出它的成因 ,尤其是高演化地区天然气气源研究。该文以塔里木盆地海相腐泥型天然气为例 ,根据天然气组成ln(C2 /C3)与 (δ1 3C2 -δ1 3C3)以及甲烷碳同位素特征判识其成因。塔北地区的干气主要为干酪根晚期裂解气 ,塔北英买力奥陶系及塔中石炭系的天然气主要为原油裂解气
Natural gas can be derived from kerogen pyrolysis gas, but also from crude oil pyrolysis gas. For sapropelic organic matter, the vast majority of natural gas is derived from source rock cracked gas, only part of the pyrolysis gas from kerogen. Therefore, the study of natural gas source not only indicates which source rock comes from, but also points out its genesis, Especially in high-evolution areas of natural gas source research. Taking the marine sapropelic natural gas in the Tarim Basin as an example, the genesis of the natural gas in the Tarim basin is analyzed based on the composition of natural gas (ln (C2 / C3) and δ1 3C2-δ1 3C3) and the carbon isotope characteristics of methane. Dry gas in the northern Tarim basin is mainly kerogen pyrolyzed gas. The British Ordos series in Tarim and the natural gas in the Tarim Carboniferous are mainly crude oil cracked gas