束鹿凹陷斜坡带沙三段扇三角洲特征及含油性
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摘要
利用大量钻井的岩电组合特征和岩心观察结果,结合地震相和测井相模式,以及粒度、岩矿等分析资料,对束鹿凹陷斜坡带沙三段广泛分布的砾岩体成因进行了深入的分析。结果表明:这些砾岩体以冲积的形式前积到浅水湖盆中,平面上的三分性和纵向上的三层结构较明显,具有重力流和牵引流双重成因的沉积构造;以片状颗粒流或辫状水道砂砾岩为主要骨架,河口坝不发育;随物源区母岩性质的不同,导致扇三角洲的形成机制和沉积特征存在明显的差异性,形成以片状颗粒流为主导作用的扇三角洲和以河流作用居重要地位的扇三角洲。认为这两种扇三角洲储层物性的影响因素不同,储集空间、储集性能和含油性也各具特色。
On the basis of abundant Lithologicelectric characteristic and core observation of wells drilled,and also through studying seismic and logging facies models, and numerous data of analyses, the conglomerate bodies, which are widely distributed over the slope zone of the 3rd Member of the Shahejie Formations in Shulu Sag, are studied. It is suggested that they belong to fan delta sedimentary systerms. These conglomerate bodies go forward the shallow lacustrine basins in the form of alluviation, their three parts in plan and three layer structures in vertical section can be clearly distinguished. They have the depositional structure formed by gravity flow and traction flow, the sheet grainflow and braid channel conglomerate are their main skeletal bodies,and the river mouth bars are difficult to be formed. But with the difference of the original Lithological properties in the provenance area, the forming mechanism and depositional characteristic of the fan delta have evident diversity. In the end, two types of fan delta can be distinguished. One is the fan delta, which sheet grainflow played a leading role, the second is the fan delta which fluvial influence held sway in the depositional process.The two types of fan delta have different factors to affect their physical natures,so their respective reservoir spaces,reservoir conditions, and oilbearing properties are distinctive.
On the basis of abundant Lithologicelectric characteristic and core observation of wells drilled,and also through studying seismic and logging facies models, and numerous data of analyses, the conglomerate bodies, which are widely distributed over the slope zone of the 3rd Member of the Shahejie Formations in Shulu Sag, are studied. It is suggested that they belong to fan delta sedimentary systerms. These conglomerate bodies go forward the shallow lacustrine basins in the form of alluviation, their three parts in plan and three layer structures in vertical section can be clearly distinguished. They have the depositional structure formed by gravity flow and traction flow, the sheet grainflow and braid channel conglomerate are their main skeletal bodies,and the river mouth bars are difficult to be formed. But with the difference of the original Lithological properties in the provenance area, the forming mechanism and depositional characteristic of the fan delta have evident diversity. In the end, two types of fan delta can be distinguished. One is the fan delta, which sheet grainflow played a leading role, the second is the fan delta which fluvial influence held sway in the depositional process.The two types of fan delta have different factors to affect their physical natures,so their respective reservoir spaces,reservoir conditions, and oilbearing properties are distinctive.
引文
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[6] 李文厚,林晋炎,袁明生.吐鲁番-哈密盆地的两种粗碎屑三角洲[J].沉积学报,1996,14(3):113-121.
[7] 赵澄林,张善文,袁 静,等.胜利油气区沉积储层与油气[M].北京:石油工业出版社,1999.12-18.
[2] 薛良清,GALLOWAYWE.扇三角洲、辫状河三角洲与三角洲体系的分类[J].地质学报,1991,65(2):141-151.
[3] 梅志超.沉积相与古地理重建[M].西安:西北大学出版社,1994.57-65.
[4] 蔡治国,郑国光,崔占堂.冀中油气区第三纪地层及微体古生物群[M].北京:科学出版社,1998.367-369.
[5] 刘宝,余光明,陈成生.西藏日喀则地区第三系大竹卡组砾质扇三角洲——片状颗粒流沉积[J].岩相古地理,1990,10(1):1-11.
[6] 李文厚,林晋炎,袁明生.吐鲁番-哈密盆地的两种粗碎屑三角洲[J].沉积学报,1996,14(3):113-121.
[7] 赵澄林,张善文,袁 静,等.胜利油气区沉积储层与油气[M].北京:石油工业出版社,1999.12-18.
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