生物礁地震地质综合识别技术——以ZJ坳陷为例

Integrated seismic and geological identification technology of reefs: taking ZJ Depression for example

生物礁因具高孔隙度、高渗透率且富含大量的油气资源而得到广泛关注。生物礁在地震剖面上的反射特征与火成岩体、火山锥、砂体、古潜山、泥底辟及岩丘等地质体极为相似,构造解释和识别相对困难。为此,以ZJ坳陷区生物礁为例进行地震地质综合识别研究,通过宏观地震相、地震属性、地震反演及沉积相等综合分析,正确地识别出了古隆起生物礁、台地边缘生物礁和斜坡—盆地中孤立礁等3种类型生物礁,同时利用生物礁相模式对单个礁体进行解剖,准确识别礁体边界,共划分出7个生物礁有利区,解决了该区无井区生物礁识别问题,从而为勘探甜点区优选提供有利依据,大大提高了钻探成功率。

Reefs have attracted wide attention because of their high porosity,high permeability and large amount of oil and gas resources.The seismic reflection characteristics of the reef are very similar to the structural characteristics of the igneous rock,volcano,sand,ancient buried-hill,mud diapir and rock hill,which makes it difficult to correctly identify the reef.This paper takes the ZJ Depression reef as an example to research the integrated seismic and geological identification technology of reefs.Through macroscopic seismic facies,seismic inversion and seismic geology analysis,the three types of reefs are correctly identified including the Paleo uplift reef,the platform margin reef and the slope isolated reef.The reef boundary and seven reefs are accurately identified and the reefs recognition in no-well area is resolved.This provides a favorable basis for the exploration and improves the drilling rate successfully.