STUDY OF SEQUENCE STRATIGRAPHY AND SUBTLE RESERVOIRS IN THE BIYANG SAG OF THE NANXIANG BASIN
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摘要: 运用T—R旋回基本理论,结合地震剖面反射特征和层序地层学以及区域连井剖面层序地层学解释,建立了南襄盆地泌阳凹陷古近系3级层序地层格架,将该区古近系核桃园组—廖庄组划分为1个Ⅰ级T—R旋回和4个Ⅱ级T—R旋回,并将核桃园组进一步划分为9个Ⅲ级T—R旋回,并进一步分析了泌阳凹陷T—R旋回层序中的沉积体系与沉积层序模式.在以上研究的基础上,对泌阳凹陷隐蔽油气藏分布规律进行了研究,发现其分布受凹陷地质构造与沉积特征控制,具有明显的分带性.同时结合本地区的生、储、盖组合,对泌阳凹陷油气藏进行了综合评价,指出了有利区带和有利勘探方向.Abstract: Based on T-R cycle theory,combined with seismic profile reflection characteristics and sequence stratigraphic analysis as well as local well profile sequence stratigraphic analysis,it is discussed in this paper the 3-grade sequence stratigraphic frameworks in the Lower Tertiary,the Biyang Sag,the Nanxiang Basin.The Hetaoyuan and Liaozhuang Formations of the Lower Tertiary in the Biyang Sag are divided into 1 Ⅰ-grade T-R cycle and 4 Ⅱ-grade T-R cycles.The Hetaoyuan Formation is subdivided into 9 Ⅲ-grade T-R cycles.Sedimentary system and sedimentary sequence patterns in T-R cycles in the Biyang Sag are analyzed.Studies of the distribution pattern of subtle reservoirs in the Biyang Sag indicate that,subtle reservoirs are zoned controlled by geologic structure and sedimentary characteristics.Taking into consideration of oil generation,accumulation and overlying formation in the region,the favorable exploration targets in the sag are predicted.
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Key words:
- T-R cycle /
- sequence stratigraphy /
- sedimentary system /
- subtle reservoir /
- the Biyang Sag /
- the Nanxiang Basin
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