海—塔盆地中部断陷带南二段油藏主控因素及模式MAIN CONTROLLING FACTORS AND K1N2 OIL RESERVOIR ACCUMULATING MODELS IN CENTRAL RIFT BELT OF HAITA BASIN
付志新
FU Zhixin
摘要(Abstract):
通过油藏解剖和油藏与成藏条件之间空间匹配关系研究,认为:海—塔盆地中部断陷带南二段油藏主要为分布在断阶带、断鼻和洼中隆上的断层油藏;南二段油藏分布受南一段源岩分布范围、断陷中断阶带和洼中隆的位置、扇三角洲前缘亚相砂体分布、早期伸展断裂沟通生油岩与储层程度等4个主要因素控制;油气成藏模式为洼槽中南一段源岩生成的油气在浮力作用下,通过早期伸展断裂错断与南二段储层侧接,向断阶带或洼中隆上的断块和断层—岩性圈闭中运移聚集成藏的模式。
Oil reservoir anatomy and spatial matching relation between the reservoirs and their accumulating conditions show that K_1n_2 oil reservoirs in Central Rift Belt of Haita Basin are main the fault ones distributed in the fault terrace belts,faulted noses and uplifts in the sags;K_1n_2 oil reservoir is mainly dominated by the following four factors:distribution scope of K_1n_1 source rocks,the locations of the fault terrace belts and uplifts in the sag,sandbody distribution in the fan-delta front sub-facies,connectivity of the early expanding faults with the oil-generating rocks and reservoirs;the petroleum accumulation models are shown as follows;the oil and gas generated in K_1n_1source rocks of the sags laterally connect with K_1 n_2 reservoir with the help of the early expanding fault leaping and under the action of the buoyancy,and then migrate and accumulate into the fault terrace belts or fault blocks on the uplifts and moreover the fault-lithology traps.
关键词(KeyWords):
海—塔盆地;中部断陷带;南二段;成藏模式;主控因素;断裂
Haita Basin;Central Rift Belt;K_1n_2;reservoir accumulation model;main controlling factor;fault
基金项目(Foundation): 国家油气重大专项课题“大气田形成条件、成藏机制与富集规律研究”(2011ZX05007)
作者(Author):
付志新
FU Zhixin
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- 海—塔盆地
- 中部断陷带
- 南二段
- 成藏模式
- 主控因素
- 断裂
Haita Basin - Central Rift Belt
- K_1n_2
- reservoir accumulation model
- main controlling factor
- fault