齐波夫天然气储量预测法在川东地区的应用探讨

川东地区石炭系和三叠系飞仙关组鲕滩储层在部分地区勘探程度较高，经统计表明，地质静、动态相近的某一储层连片区块内，其储量数与大小排序符合齐波夫定律。用齐波夫方法估算那些目前处于“单身”气藏周边相关联圈闭的储量后，结合已有的地震、地质等资料，能够分析寻找到新的钻探目标。文章从引用的预测方法入手，列举了川东地区几个储层连片区块内（石炭系或飞仙关组）气田已探明的储量，以地质分析为前提，预测到铁山坡已获储量区块的外围、南门场构造主体北段仍存有可观储量，沙坪场、西河口、高峰场邻近石炭系还存在勘探有利目标。估算川东开江-梁平海槽东北侧飞仙关组储层连片区前十名气藏的储量之和将超过3200×１０^８ｍ^３。

APPLICATION OF ZIPFS GAS RESERVES PREDICTION METHOD IN EAST SICHUAN AREA 1)

The oolitic beach reservoirs of Carboniferous and Triassic Feixianguan group have high exploration level in some regions. Statistics show the rank of reserves and sizes fits Zipfs law in a reservoir connecting block, which has similar geological static and dynamic states. After the reserves of the associated traps around the recent “single” gas reservoir are estimated by Zipfs method, integrating the available seismic and geologic data, the new drilling targets can be found. Taking the certified reserves of the gas fields of Carboniferous and Feixianguan group in several reservoir connecting blocks of east Sichuan area as examples, the introduced prediction method is demonstrated. Based on geological analysis, it is predicted there are rather more reserves in the skirt of Tieshanbo block where reserves are found and the north section of Nanmenchang main structural body. There are still favor targets of exploration in Carboniferous near Shapingchang, Xihekou and Gaofengchang. It is estimated the reserve amount of the first ten ranks of gas reservoirs will exceed 320 BCM in the reservoir connecting blocks of Feixianguan group in the northeast side of Kaijiang Liangping marine geosyncline of east Sichuan.