ANALYSIS OF RESERVOIR FORMATION PERIODS, THE JIANGLING DEPRESSION OF THE JIANGHAN BASIN
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摘要: 以含油气系统理论为指导,根据油-岩对比分析,认为江陵凹陷存在两个含油气系统:沙市组上段—新沟咀组下段含油气系统和潜江组含油气系统。前一含油气系统形成期为沙市组上段—荆河镇组沉积期,油气藏主要形成期为潜江组—荆河镇组沉积期,其后为改造期,由于广泛发育的断层在油气输导体系中起着重要的作用,致使该油气系统具有多层位同期成藏特征,决定了在该凹陷应坚持多层系原、次生油藏并举的立体勘探方针,开拓新沟咀组上段、荆沙组和潜江组勘探领域;后一含油气系统为未熟—低熟含油气系统,应作为江陵凹陷一潜在的勘探领域进行侦察勘探。Abstract: Based on the guidance of petroleum system theory and oil-source rock correlation, there are 2 known petroleum systems in Jiangling Depression: upper Shashi formation-lower Xinggouzhui formation and Qian-jiang formation. The major period of reservoir formation for the former one was in the time of sedimentation of Qianjiang-Jinghezhen Formation, after which, it was modified. The petroleum system is characterized by multiple horizons of contemporaneously formed reservoirs because the extensively developed faults act as the important pass in hydrocarbon transmission system. Therefore, the exploration strategy in the depression should be focused on both the primary and the secondary hydrocarbon reservoirs and pay some attention to the upper Xinggouzhui formation, Jingsha formation, Qianjiang formation. Qianjiang formation petroleum system belongs to immature-premature petroleum system, which should be the new exploration area.
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Key words:
- petroleum system /
- geologic factors /
- reservoir formation period /
- Jiangling Depression
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