Accumulation and Diffusion Gas Rate Characteristics for the Formation of Large and Medium Gas Fields with Different Reserves Abundance in China
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摘要: 通过我国41个大中型气田天然气扩散散失量计算和地质储量、含气面积及形成时期统计，对其扩散散失气速率、聚气速率和聚散气速率比值进行了研究，得到我国41个大中型气田天然气扩散散失气速率为0.2×106～49.5×106 m3/km2Ma，平均为7.2×106 m3/km2Ma，聚气速率为2.1×106～528.1×106 m3/km2Ma，平均为79.4×106 m3/km2Ma，聚散气速率比值为1.5～94.2，平均为14.5。通过我国41个大中型气田储量丰度与聚散气速率比值关系研究得到，二者为正比关系，聚散气速率比值越大，大中型气田储量丰度越高；反之则越低。我国要形成高储量丰度大中型气田的聚散气速率比值最小应大于4.1，中等储量丰度大中型气田形成的聚散气速率比值在4.1～2.3之间，低储量丰度大中型气田形成的聚散气速率比值应小于2.3。Abstract: By the calculation of gas diffusion amount of 41 large and medium gas fields in china and statistics of their geological reserves, gasbearing area and formation period, gas diffusion rate, gas accumulation rate and the ratio of gas accumulation and diffusion rate were studied. It was considered that gas diffusion rate of 41 large and medium gas fields in China 0.2×106 m3/km2Ma to 49.5×106 m3/km2Ma, average 7.2×106 m3/km2Ma. Gas accumulation rate is 2.1×106 m3/km2Ma to 528.1×106 m3/km2Ma, average 79.4×106 m3/km2Ma. The ratio of gas accumulation and diffusion rate is 1.5 to 94.2, average 14.5. By the study of the relation between reserves abundance and ratio of gas accumulation and diffusion rate of 41 large and medium gas fields in China, it was considered that they have proportional relation. The greater the ratio of gas accumulation and diffusion rate is, the greater the reserves abundance of large and medium gas fields is, conversely the lower. The ratio of gas accumulation and diffusion rate for the formation of large and medium gas fields with high reserves abundance should be at least greater than 4.1. The ratio of gas accumulation and diffusion rate for the formation of large and medium gas fields with medium reserves abundance should be at least between 4.1 and 2.3. The ratio of gas accumulation and diffusion rate for the formation of large and medium gas fields with low reserves abundance should be at least lower than 2.3.
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