齐家—古龙凹陷中心线以西油气储量预测

Prediction of Oil and Gas Reserves on the West of the Centerline of Qijia-Gulong Sag,Songliao Basin

齐家—古龙凹陷是松辽盆地的主要油气源区。为了预测该凹陷中心线以西部分油气储量,利用油田规模序列法对研究区内油气田的数量、规模及其总储量进行了预测。预测结果表明,本区的油气田规模在双对数坐标上呈非常好的线性关系,预测误差相当小,预测待发现储量为0.93×108t,尚有32个油气田待发现。根据本区构造、圈闭、储层的发育以及油气生成、运移等特征分析,油气田储量和数量主要发育在齐家—古龙凹陷的西部。

Qijia-Gulong sag is the main source area of oil and gas in Songliao Basin. A part of oil and gas from the source is held up in the sag, while the other migrates to the clinoform zone in the west. In order to calculate the oil and gas reserves on the west of centerlineof Qijia-Gulong sag, the number, size and total reserves of oil-gas fields are calculated by using the rank order system of oil field scale.The result shows that there is a good linear relationship between the size of oil-gas fields and their reserves on the log-log coordinate.There is little calculating error. What's more, it is revealed that there are still 93 million tons undiscovered reserves of oil and gas, still32 oil and gas fields to be discovered. According to the features analysis of structure, trap, reservoirs and the formation and migration ofoil and gas, the number and reserves of oil-gas fields distributed mainly in the west of Qijia-Gulong sag.