渤南BZ28-2油田油气成藏主控因素及模式  

MAIN CONTROLLING FACTORS AND MODELS FOR THE PETROLEUM ACCUMULATION OF BZ28-2 OILFIELD IN SOUTH BOHAI-BAY BASIN

作　　者：徐宏[1] 

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《大庆石油地质与开发》2013年第4期11-14,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家油气重大专项课题"国家大型油气田及煤层气开发"(2017ZX05007-002)资助

摘　　要：在分析油藏类型及油气分布规律的基础上,采用油气分布与成藏条件空间匹配的研究方法,对BZ28-2油田油气成藏主控因素及模式进行了研究。认为:渤南油气成藏主要受到油源、断裂、砂地比和构造等4个主要因素控制,即油源断裂是油气垂向运移的主要输导通道,砂地比大小控制着油气侧向分流聚集层位,油源断裂附近的正向构造是油气聚集的有利部位,断裂后期活动破坏了早期断层的封闭性,不利于油气保存;油气成藏模式为下伏沙三段源岩生成的油气沿油源断裂向上覆明下段运移,由于受到明上段区域性盖层阻挡,向砂地比大的明下段侧向分流,在油源断裂附近的正向构造上的断背斜、断块和断层一岩性油藏中聚集成藏。On the basis of analyzing the types of oil reservoirs and petroleum distribution laws, the studies of the main controlling factors and models for the petroleum accumulation of BZ28-20ilfield are conducted with the help of the researching method of the spacial matching between the petroleum distribution and the conditions of the reser- voir accumulation. The results show that the accumulation in South Bohai-Bay Basin is generally controlled by the following four main factors： oil source, faults, sandstone-formation ratio and structures. In detail, the faults in the oil source are the principal transporting pathways for the petroleum migration ; the size of the ratio controls the later- al diverting and migration position of the hydrocarbon ; the normal structures near the faults are the favorable places for oil and gas to accumulate, and moreover the activities in the late fault period have damaged the sealing perform- ance of the early faults, so the petroleum is difficult to preserve. The petroleum accumulating model is that when the hydrocarbon generated in underlying Es3 source rock migrating to Nm I along the oil-source faults, because of the seal of Nm II regional caprock, the hydrocarbon migrates laterally to Nm I with high sandstone-formation ratio and accumulates in the faulted anticlines, fault blocks and fauh-lithological reservoirs on the positive structures near the oil source faults.

关 键 词：渤南BZ28-2油田 油气成藏主控因素 模式 油源 断裂 砂地比 

分 类 号：TE355[石油与天然气工程—油气田开发工程]