结构张量导向储层预测技术在LS地区的研究与应用

Application of reservoir prediction technology on the structural tensor oriented in the LS area

LS地区碳酸盐岩奥陶系目的层主要发育洞穴型、孔洞型和裂缝型3种类型储层,储层非均质性强,且储集规模受多期活动走滑断裂体系控制,断控储集体储层地震响应特征复杂多样,预测与描述难度大。在前期研究的基础上,从梯度结构张量、张量薄化、构造应力理论入手,对不同类型储层进行实际应用效果测试分析,逐步形成了梯度结构张量定断控储集体轮廓,张量薄化、结构张量约束波阻抗反演、构造应力等属性结合有效地进行区分预测孔洞缝不同类型储层,多属性融合雕刻技术描述断控储集体空间展布特征,在LS地区实际应用中证实了技术的有效性及适用性,有效指导了后期目标优选和钻井设计,对SB油田超深层断控缝洞体勘探开发具有重要意义。

The Ordovician target layer of carbonate rocks in the LS area mainly develops three types of reservoirs:cave,hole,and fracture.The heterogeneity of the reservoir is strong,and the scale of the reservoir is controlled by a system of multi-period active strike-slip faults.The characteristics of the seismic response on fault solution reservoirs are complex and diverse and are difficult to predict and describe.Based on previous research,this study,beginning with the theory of gradient structure tensor,tensor thinning,and tectonic stress,tested and analyzed the actual application effect of different types of reservoirs and gradually formed a combination of gradient structural tensors to determine the profiles of fault solution,tensor thinning,structure tensor impedance inversion based on constrained wave,tectonic stress,and other attributes to effectively distinguish and predict different types of reservoirs(cave,hole,and fracture).The multi-attribute fusion technology describes the characteristics of spatial distribution on fault solution.The effectiveness and applicability of the technology have been verified through practical application in the LS area,which effectively guides the optimization of later targets and the design of drilling.Further,it is crucial to explore and develop ultra-deep fractures and cave bodies controlled by faults in the SB Oilfield.