| 箕状断陷湖盆缓坡带储集砂体特征、演化及控制因素——以胜利油区东营凹陷南缓坡带沙河街组为例 |
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| 关键词:half graben-like rift lake basin Shahejie Formation reservoir sand body feature, |
| 基金项目:中国石油天然气集团公司“九五”重点项目“东营凹陷牛庄洼陷沙三中段岩性体微地质环境及储层特征研究” |
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| Characteristics, Evolution and Controlling Factors of the Terrigenous Clastic Reservoir Sand Bodies on the Gentle Slope Zone of the Half-Graben Rift Lake Basin--A Case Study of the Shahejie Formation on the Southern Gentle Slope Zone of the Dongying Depression in the Shengli Oil Field |
| This paper presents a case study of Shahejie Formation on the southern gentle slope zone of Dongying half-graben rift lake basin in the Shengli Oil Field. The sedimentological and geophysical features of Shahejie Formation can be generalized into five types: ① Alluvial fan: It is composed of pebbled sandstone, seriate poststone, siltite and pelitic siltstone. On the well log, the fan root assumes the shape of high amplitude box and bell, the middle fan shows middle amplitude disperse dental or bell form, and the front fan is of low amplitude disperse dental form. On seismic facies, the fan root assumes random short wave.② Sand body of fluvial facies: It is composed of seriate sandstone, sandy gravel, siltstone and gray or purple mudstone. On the well log, it changes regularly from the lower part cycle to the upper part cycle. The lower part cycle is box-bell-shaped whereas the upper part cycle is a parallel mudstone baseline on seismic reflection. It shows trough filling and internally assumes short wave random reflection or middle amplitude parallel reflection. ③Sand boby of delta: It is composed of pebbled sandstone, sandstone, siltite, pelitic siltstone, mudstone and carbonaceous shale. On the well log, the delta plain shows high amplitude bell shape, with the bottom being the surface of discontinuity. The delta front assumes funnel-shaped negative anomaly on the spontaneous potential curve. It shows low amplitude zigzag form on the apparent resistivity curve. The prodelta shows smooth flat curve intercalated with short sectors of dental curves. ④Sand body of beach shallow lake: It is composed of gray-green siltite, poststone and pebbled sandstone. On the well log, it shows such forms as the combination of inverted clock and bell, finger, smooth box or zigzag shapes. On seismic reflection, it assumes subparallel, intermediate abundance, flat and wavy bar reflection configurations.⑤ Sand body of gentle turbidity: It is composed of pebbled sandstone, sandstone siltite and mudstone. On the spontaneous potential curve, it shows box-washing-fingerlike-zigzag form. On the seismic profile, it assumes upper form or foreset form reflection. On the basis of the above studies, this paper deals with the time-space evolution regularity of various sand bodies and the factors controlling their development. |
| TIAN Jing-chun,CHEN Xue-hua,HOU Ming-cai,XIA Qing-song,ZHANG Xiang,ZHENG He-rong,XIAO Huan-qin,QIU Gui-qiang,WANG Ju-feng.2004.Characteristics, Evolution and Controlling Factors of the Terrigenous Clastic Reservoir Sand Bodies on the Gentle Slope Zone of the Half-Graben Rift Lake Basin--A Case Study of the Shahejie Formation on the Southern Gentle Slope Zone of the Dongying Depression in the Shengli Oil Field[J].Acta Geoscientica Sinica,25(3):331-336. |
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