建场测深技术新进展——三塘湖盆地马朗凹陷石炭系结构属性研究实例

The new developments in field modeling and sounding technique——a case study in Carboniferous structure attribute studies in Malang Depression,Santanghu Basin

石炭系是三塘湖盆地的重要含油气层系,但由于地震勘探在深层难以得到有效反射信息,导致对盆地内石炭系的内部结构认识不清,制约了油气勘探进程。本文将多频段高信噪比建场测深采集和广义逆二维约束反演为核心的一体化技术,用于该盆地马朗凹陷的油气勘探。应用结果表明,建场测深法能够揭示石炭系多套层系及其中分布的火山岩体,并指出上石炭统哈尔加乌组低阻电性层是泥质碎屑岩发育的烃源层,卡拉岗组和巴塔玛依内山组高阻电性层是火山岩发育的有利储集层,并为钻探结果证实。

Carboniferous is the important hydrocarbon bearing strata series in Santanghu basin.As it is not easy to acquire the effective reflections for the deep target in the seismic exploration,there is no clear understanding for the inner structure of Carboniferous in the basin,restricted the oil gas exploration progress.Taking the field sounding acquisition with the multi-frequency band and high S/N ratio and generalized reverse 2D constraint inversion as the core,the new filed sounding technique with integration of acquisition,processing and interpretation was introduced in the paper and then used in the oil gas exploration in Malang Depression in the Basin.The application results showed that this method can reveal the multi sets of strata in Carboniferous and the distributed volcanic rocks inside the strata.The paper also pointed out that the Haerjiawu Group low resistivity stratum is the hydrocarbon source beds developed from the shaly clastic rocks,and the layers with high resistivity electricity characteristic in Kalagang Group and Batamayineishan Group are favorite reservoir developed from the volcanic rocks,which is proved by the drilling result.