摘要
研究块体搬运沉积有助于揭示深水重力流沉积的分布和演化,对深水储层预测和圈闭评价具有重要意义。利用高分辨率三维地震资料进行深水块体搬运复合体的识别、演化规律以及在油气勘探中的意义进行探讨。研究发现:深水块体搬运复合体表现为弱振幅、杂乱、丘状地震反射,块体搬运复合体底部具有明显的线性侵蚀擦痕;块体搬运复合体常常与浊积水道、堤岸沉积伴生出现;块体搬运复合体对早期浊积岩侵蚀形成大量残余地层,残余浊积岩与块体搬运复合体可以形成潜在的深水地层圈闭。尽管块体搬运复合体本身不能作为有效的储层,但这些沉积体的准确识别可以提高深水浊积水道储层预测的精度,许多侵蚀过程和围绕块体搬运沉积所发育的地层关系提供创造地层圈闭的机会。
Research on Mass transport complexes （MTCs） can help disclosure the distribution and evolution of gravity flow sediments,especially for reservoir predicting and reservoir-seal evaluating in deep-water exploration. In this paper,high quality 3-D seismic data are used to study seismic characters and evolution of the MTCs. There are three main conclusions from this research. （1） MTCs are characterized by low amplitude,chaotic,mounded seismic facies,fanlike geometry and linear basal scours; （2） They are commonly embedded in a cyclic stratigraphic succession that is composed of levee-channel complexes and hemipelagic drapes. （3） Remnants of these complexs are formed by the erosive power of mass transport from older turbidite deposits. The remnants with portions of older turbidite sediments can form potential stratigraphic traps for deep-water deposits. Although the MTCs themselves may not prove viable reservoirs,the accuracy of reservoir predicting in deepwater turbidite channels can be improved from the identification of MTCs. Various erosive processes and subsequent stratigraphic relationships surrounding mass transport deposits development may have provided the opportunities for stratigraphic trapping.
出处
《沉积学报》
CAS
CSCD
北大核心
2010年第1期76-82,共7页
Acta Sedimentologica Sinica
基金
国家自然科学基金项目(批准号:40572067)
国家基础研究发展规划项目(编号:2009CB219407)资助
