摘要:低渗储层中的裂缝是不同时期构造应力场的产物，具有不同的裂缝样式，确定裂缝形成期次对裂缝研究和油气聚集研究具有重要意义。岩心观察法：适用于存在明显切割关系、限制终止和组系关系的裂缝，低渗储层裂缝不发育，组系性差，这种方法通常受限。产状分析法：除分析裂缝的走向外，还需要重视倾向和倾角，并结合区域和局部构造应力场对裂缝进行期次划分。充填物分析法：需结合充填物类型、特征，以及充填物形成时的沉积、构造、油气充注特征，以达到准确划分的目的。声发射方法：可能提供裂缝发育的期次，需要结合区域声发射资料及区域构造演化史，才能准确判断裂缝的具体形成时期。综合运用上述方法，得出渤海湾盆地东营凹陷牛35块沙三中裂缝的发育期次分为4期：沙三中—沙二期、沙一—东营期、东营末期和明化镇期。
关键词: 裂缝/
发育期次/
低渗储层/
沙三中/
东营凹陷
Abstract:The fractures in low permeability reservoir is the result of different tectonic stress field, showing different fracture styles. To determine the fracture development period is important to oil-gas accumulation. The fracture division method by core observation is used in fractures with obvious cutting, restrict termination, or group relationship, so this method is restricted in usually not well developed fractures of low permeability reservoir. In fracture development period study by fracture attitude, besides the analysis of fracture strike, it is very important to study the fracture dip and dip angle, and the characteristics of the regional and local tectonic stress field. In order to get an accurate fracture development period division, the method by fracture filling needs to combine the types and characteristics of the fillings, as well as the deposition, structure, or oil and gas filling characteristics when the fillings are formed. The acoustic emission can give the fracture development period, more accurate specific fracture development stage determination need to combine the regional acoustic emission data and regional tectonic evolution history. Using the methods mentioned above, the fracture development period in the middle of the Third Member of the Shahejie Formation of Niu35 fault block in Dongying Sag, Bohai Bay Basin is divided into 4 stages:Eocene when the middle of the Third Member of the Shahejie Formation deposited-the Second Member of the Shahejie Formation deposited, Miocene when the First Member of the Shahejie Formation deposited-the Dongying Formation deposited, the end of the Dongying Formation deposited, and the Pliocene when Minghuazhen Formation deposited, respectively.
Key words:Fracture/
Development period/
Low permeability reservoir/
The Third Member of the Shahejie Formation/
Dongying Sag
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