塔里木盆地顺南地区超深白云岩储层地震、地质综合预测

Integrated seismic and geological prediction of ultra-deep dolomite reservoir in Shunnan area, Tarim Basin

李宗杰 王鹏 陈绪云 李映涛

Zongjie Li Peng Wang Xuyun Chen Yingtao Li

为了查明顺南地区超深白云岩储层特征、地震响应特征及白云岩储层有利发育区，在顺南地区及邻区钻井的岩心、测井、录井与测试等资料的基础上，研究奥陶系鹰山组下段-寒武系上统岩石学特征，明确白云岩储集空间类型主要为微裂缝/裂缝和白云石晶间（溶）孔两类，白云岩储层形成受沉积相与古地貌、深部热液改造作用、断裂及构造破裂作用等多因素共同控制；基于岩心与测井资料，统计分析奥陶系鹰山组下段-寒武系上统灰岩、白云岩、砂屑灰岩、泥晶灰岩和白云质灰岩的岩石物理参数，结合三维地震资料与钻井地质标定，建立该区目的层储层地震地质模型；通过正演模拟结果、实际地震资料与地震地质模型比对分析，明确了低频-中强振幅-强连续的地震相指示白云岩储层有利发育区；利用地震波形的特征分析与能量属性预测相结合，能够有效地识别白云岩储层，从而为顺南地区目标评价与井位部署提供依据。

Aiming at understanding the geological characteristics and seismic responses and identifying the play fairway of dolomite reservoirs in Shunnan area, the core, logging and test data of wells in Shunnan and its adjacent areas were integrated to study the petrological characteristics of the Lower Yingshan Formation(Ordovician)-Upper Cambrian. The micro-cracks/fractures and dolomite intercrystalline (dissolved) pores were identified to be the main reservoir space in the dolomite, and the formation of the dolomite reservoir was jointly controlled by various factors, including sedimentary facies and paleogeomorphology, deep hydrothermal modification, faulting and fracturing. The petrophysical parameters of limestone, dolomite, calcarenite, micrite and dolomitic limestone were obtained through a statistical analysis of cores and well logging data in the Lower Yingshan Formation of the Ordovician-Upper Cambrian. A seismic geological model of the target reservoir in the area was established in combination with 3D seismic data and geological calibration to the drilling data. A comparison analysis of the forward modeling results and actual seismic data with seismic geological model revealed that the seismic facies featuring low frequency, medium high amplitude and good continuity are markers of play fairway of dolomite reservoir. The combination of feature analysis of seismic wave forms and energy attribute prediction can be applied to effectively identify dolomite reservoirs, thus providing a basis for target evaluation and exploratory well emplacement in Shunnan area.

10.11743/ogg20200106