王庄油田坨826块沙三段高分辨率层序地层学研究
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摘要
综合应用取心、测井和地震资料对王庄油田坨826块沙三段扇三角洲沉积体系的沉积类型和基准面旋回进行了研究,以基准面旋回及A/S动态变化为控制因素,在扇三角洲沉积体系中识别出5种沉积类型;根据短期旋回的叠加样式进行分析,组合成MSC1,MSC2,MSC3和MSC4共4个中期旋回,建立了满足油藏开发需要的中期基准面旋回等时对比格架。研究结果表明,中期基准面上升时期,盆地边缘部位形成的辫状水道沉积是该区优质储层集中发育段。实践证明应用高分辨率层序地层学理论划分的储层内幕精度能够满足此类油藏开发的要求。
The particularity of the fan delta depositional systems restricts the methods and precision of inner episode recognition of glu-tenite reservoirs. Sedimentary types and the base-level cycles of the fan delta depositional systems are analyzed in the third member of Shahejie Formation in Tuo 826 block of Wangzhuang Oilfield through the data of drilled core,log and seism comprehensively. Five sedimentary systems of the fan delta are classified based on the control factors of the base-level cycles and A/S dynamic variation. Four mid-term cycles of MSC1, MSC2, MSC3 and MSC4 are combined according to the super-imposition way of the short-term cycles. An isochronous correlation framework of the mid-term base-level cycle is built that will meet the need of reservoir development. The study result shows that the braided channel which was formed in the period of uprising mid-term base-level on the marginal zone of the basin is the best reservoir interval in this area. Using the theory of high resolution sequence stratigraphy can classify the reservoir inner episode. The practice proves that the precision of that can meet the demands of reservoir development.
The particularity of the fan delta depositional systems restricts the methods and precision of inner episode recognition of glu-tenite reservoirs. Sedimentary types and the base-level cycles of the fan delta depositional systems are analyzed in the third member of Shahejie Formation in Tuo 826 block of Wangzhuang Oilfield through the data of drilled core,log and seism comprehensively. Five sedimentary systems of the fan delta are classified based on the control factors of the base-level cycles and A/S dynamic variation. Four mid-term cycles of MSC1, MSC2, MSC3 and MSC4 are combined according to the super-imposition way of the short-term cycles. An isochronous correlation framework of the mid-term base-level cycle is built that will meet the need of reservoir development. The study result shows that the braided channel which was formed in the period of uprising mid-term base-level on the marginal zone of the basin is the best reservoir interval in this area. Using the theory of high resolution sequence stratigraphy can classify the reservoir inner episode. The practice proves that the precision of that can meet the demands of reservoir development.
引文
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[3]邓宏文.美国层序地层研究中的新学派——高分辨率层序地层学[J].石油与天然气地质,1995,16(2):89-97.
[4]淡卫东,张昌民,张尚峰,等.坪北油田延长统长6段第二砂层组高分辨率层序地层研究[J].油气地质与采收率,2003,10(5):4-5,15.
[5]赵翰卿.高分辨率层序地层对比与我国的小层对比[J].大庆石油地质与开发,2005,24(1):5-12.
[6]焦养泉,周海民,庄新国,等.扇三角洲沉积体系及其与油气聚集的关系[J].沉积学报,1998,16(1):70-75.
[7]李文厚,周立发,赵文智,等.酒东盆地营尔凹陷的扇三角洲[J].石油与天然气地质,1997,18(4):300-304.
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