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南海L盆地深水区,不仅有新近系生物礁发育的良好环境,更有生物礁油气藏形成的优越条件,是未来深水区勘探的重要领域.在生物礁储层评价、油气预测研究中,由于研究对象多为孔缝洞发育的细微储层结构,常规地震勘探多基于理想均匀介质或层状介质来研究储层结构,这显然容易忽略实际生物礁储层的局部非均质性对地震波响应特征和传播规律影响.本文以L盆地生物礁为例,在层序地层划分及沉积相分析双重约束下利用相对阻抗反演技术有效建立了生物礁储层框架模型,采用孔洞随机介质模拟技术对储层内部孔洞裂缝进行精细雕刻,建立能精细描述生物礁储层内强非均质性及孔缝洞物性特征的随机介质模型.最后通过正演模拟,定量地分析了盆地内生物礁储层的物性特征,从而进一步明确了盆地内寻找优质储层的方向,为勘探目标的寻找与优选提供科学的理论指导.
It is not only the favorable environment for the development of bio-reefs in the Neo-system but also the superior conditions for the formation of bio-reefs and reservoirs in the deep-water area of the L basin in the South China Sea, which will be an important area for exploration in the future deep-water areas.In the reef reservoir evaluation and hydrocarbon prediction, Most of the research objects are fine reservoir structures developed in pore-boreholes. Conventional seismic surveys mostly study reservoir structures based on ideal homogeneous medium or stratified medium. It is obviously easy to ignore the influence of local heterogeneity of real reef reservoirs on seismic response Characteristics and propagation laws of the reefs in this paper.Based on the reef in the L basin, this paper established a framework model of reef reservoir by using the relative impedance inversion technique under the dual constraints of sequence stratigraphy and sedimentary facies analysis. By using the stochastic medium simulation technique Fine cracks were carved in the reservoir to establish a stochastic medium model that can describe the strong heterogeneity and the physical properties of the hole in the reef reservoir.Finally, through the forward modeling, we quantitatively analyzed the reef reservoir So as to further clarify the direction of finding high-quality reservoirs in the basin and provide scientific theories for the search and optimization of exploration targets Guide.