| 深水湖盆沉积砂体的层序地层分析--以四川侏罗系为例 |
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| 引用本文： | 吴因业,张天舒,陶士振,冯荣昌.深水湖盆沉积砂体的层序地层分析--以四川侏罗系为例[J].沉积学报,2013,31(5):798-806. |
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| 作者姓名： | 吴因业 张天舒 陶士振 冯荣昌 |
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| 作者单位： | 中国石油天然气股份有限公司勘探开发研究院 |
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| 摘 要： | 层序地层学方法标志着沉积地质学最新的一次革命，作为多学科的方法融合，它把自源作用（来自沉积体系内部）和异源作用（来自沉积体系外部）分析，形成了统一模式来解释沉积盆地的演化和地层结构，并在油气勘探中得到广泛应用，这对于减少储层预测风险尤其有效。深水湖盆沉积砂体主要有三角洲前缘向深水斜坡的进积砂体、重力流砂体包括浊积水道砂体、浊积扇砂体和碎屑流砂体。非水道化的浊积砂体分布与盆地坡度、体系域演化密切相关，高坡度地区发育三角洲前缘向深水斜坡的滑塌浊积砂体，其他地区在湖侵早期和湖退晚期发育非水道化的湖底扇浊积砂体。层序体系域结构的重建和沉积机理的分析大大提高了沉积砂体的预测精度，减少储层预测风险。这些沉积砂体孔隙度低，渗透率也低，薄片观察发现极细砂为主。分选性中等，磨圆度次棱角状。碎屑成分主要为石英和石英岩岩屑，少许长石，另见方解石碎屑。胶结物主要为方解石。他们属于低孔低渗储集层，可以成为裂缝性油气藏和非常规油气资源的勘探目标。
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| 关 键 词： | 四川侏罗系 层序地层学 沉积学 体系域 深水沉积环境 储集层 高密度浊流 |
Sequence Stratigraphy of Depositional Sandbodies in the Deep-water Lake Basin: A case from Jurassic Sichuan |
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| WU Yin-ye;ZHANG Tian-shu;TAO Shi-zeng;FENG Rong-chang. Sequence Stratigraphy of Depositional Sandbodies in the Deep-water Lake Basin: A case from Jurassic Sichuan[J].Acta Sedimentologica Sinica,2013,31(5):798-806. |
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| Authors: | WU Yin-ye;ZHANG Tian-shu;TAO Shi-zeng;FENG Rong-chang |
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| Institution: | WU Yin-ye;ZHANG Tian-shu;TAO Shi-zeng;FENG Rong-chang;RIPED of Petro China; |
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| Abstract: | The method of sequence stratigraphy marks a new revolution of sedimentary geology. It uses multiple subjects to form a sedimentary model to interpret evolution and stratigraphic structure of sedimentary basin for oil and gas exploration based on analysis of autocycle and allocycle. Sequence stratigraphy is useful to decrease the risks of reservoir prediction. The main types of sedimentary sandbodies of deep-water lake basin are progressive sandstones from delta front to slope, gravity flow sandstones including turbidite channel, basin floor fan and debris flow sandstones. The distribution of non-channellized turbidite sandstones has closely relation with basin slope and systems tract evolution. There are developed sliding turbidite from delta front to slope in high-gradient areas, and developed basin floor fan turbidite in other areas during early transgressive and late regressive period. The rebuilding of sequence and systems tracts and analysis of sedimentary mechanism would increase predicting ability of reservoirs and decrease risks of reservoir prediction. These turbidite sandstones have low porosity and low permeability, with very fine grains on thin section observation. There are median sorting and poor rounding in grains. The clastic contents are quartz, quartz sandstone, and minor feldspar and calcite. The cements are mainly calcite. They belong to low-porosity and low permeability reservoirs which could be as exploration targets of fracture reservoirs and unconventional resources. |
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