Quantitative characterization of the depositional system in Gas field A, Pinghu slope belt, Xihu Sag and its bearing on periodicity of sea level changes
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摘要:
西湖凹陷平湖斜坡带平湖组是西湖凹陷重要的油气勘探开发层系之一，明确其沉积背景、演化规律、探讨深层储层保存机制是提高地质油藏预测准确率的关键。综合利用岩心、测井（△GR）等资料对A气田沉积体系进行定量表征，并基于米兰科维奇旋回理论，通过小波变换、频谱分析等手段，结合全球海平面变化规律，对A气田平湖组海平面变化周期性进行探讨分析。结果表明，A气田平湖组沉积体系自下而上可分为潮控三角洲沉积体系、潮-河联控三角洲沉积体系及河控三角洲沉积体系。同时在潮控三角洲沉积体系及潮河联控三角洲沉积体系中共识别7次大规模海平面升降事件，其中以P7海平面升降规模最大，每次海平面升降周期约405ka。最后基于7次海平面升降事件指导气田内高频层序划分，且重点对P7—P6层砂体发育规律、展布特征进行分析，结合储层物性纵向变化规律认为，潮汐作用对研究区内砂体具有一定的改造作用，有利于纯净砂岩的发育，预测A气田潮下带潮汐改造砂体是未来有利勘探开发方向。
Abstract:The Pinghu Formation in the Pinghu slope zone is one of the most important oil and gas exploration targets and gas producers in the Xihu Depression of the East China Sea. The key to improve the accuracy of reservoir prediction should be put on the right clarification of sedimentary background, evolution pattern and the mechanism of deep reservoir preservation. In this paper, the depositional systems of the Gas field A are quantitatively characterized with coring and well logging data. Our results suggest that the Pinghu Formation of the Gas field A consists of three depositional systems, i.e. the tidal delta system, tidal-river delta system and river delta system in ascending order. In addition to it, the periodicity of sea level fluctuation of the Pinghu Formation is analyzed by means of wavelet transform and spectrum analysis upon the global sea level changes or so-called Milankovitch cycles. Seven transgression events are identified, among which the P7 is the largest, and each cycle lasted for a time span of about 405 ka. Based on this, the isochronal sequence stratigraphic frameworks of the gas field are established. Finally, on the basis of high-frequency sequence framework and evolutionary pattern, the distribution characteristics of sand bodies in the layers of P7-P5 are carefully analyzed. Combined with the vertical variation in reservoir physical properties, it is considered that the reworking of sand bodies by tidal activities is critical important to the enhancement of the physical properties of the sandstone reservoirs. Therefore, the tidal sand bodies in the subtidal zone are the most favorable targets for oil and gas exploration.
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Key words:
- depositional system /
- quantitative characterization /
- sea level change /
- Gas field A
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