摘要
通过对济阳坳陷四扣洼陷及郭局子地区泥质岩储层的裂缝类型、识别特征进行的研究 ,认为影响本区裂缝发育程度的因素是区域构造应力及构造部位、岩性、岩相、岩层厚度、埋深及地层压力。并在此基础上建立了地质模型、力学模型和数学模型 ,运用三维有限元方法对四扣洼陷构造裂缝储层的分布进行了预测。通过预测 ,提出了研究区裂缝发育在平面上具有不均匀性、连片性差、与断层关系密切的特点 ,并进一步指出了罗 4 2—罗 4 8井区等 8个区带为裂缝发育的地区。这项研究不仅对研究区泥岩油气勘探 ,而且对济阳坳陷及类似地区的泥岩油气勘探有重要指导和启示意义。
In the southeastern part of Sikou sag in Jiyang depression,fractural reservoirs are found in muddy and shaly rocks of No.3 member in Shahejie Formation,and high oil production is obtained in some wells. The lithology of productive formation includes oil shale,oil mudstone,limy mudstone and marlstone. Studies on core and thin sections showed that there are 4 types of fractures: extensional fractures, shearing fractures, diagenetic shrinkage fractures and fractures due to abnormal pressure.The genetic mechanism and identification criteria of these fractures are different. Statistics showed that the extensional fracure is the most important type among them. Regional tectonic stress, lithology, lithofacies,thickness and depth of rocks are main factors influencing the extensional fracture distribution.Based on above analysis, the geological, mechanical and mathematical models were built up. Using 3 D finite element numerical simulation method, the authors made a regional stress and extensional fracture distribution prediction and pointed out 8 favored exploration target districts.
出处
《高校地质学报》
CAS
CSCD
2002年第1期96-105,共10页
Geological Journal of China Universities
