Sedimentary microfacies of Member 5 of Xujiahe Formation in the Dongfengchang area, Sichuan Basin

Q1 Earth and Planetary Sciences Petroleum Research Pub Date : 2024-09-01 DOI:10.1016/j.ptlrs.2024.03.003
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Abstract

Member 5 of the Upper Triassic Xujiahe Formation (T3X5) in central Sichuan Basin has made a breakthrough in exploration recently. However, this new stratum has not been investigated sufficiently with respect to basic geology, making its types and distribution of sedimentary facies unclear, which severely restricts its subsequent exploration evaluation. In this study, types of sedimentary microfacies in the first sand group of T3X5 (T3X51) are clarified through core observation and logging interpretation using core, log and seismic data, and then distribution of sedimentary microfacies in T3X51 is determined according to seismic waveform features and seismic prediction. The results show that T3X51 in the Dongfengchang area is mainly composed of deltaic deposits of several microfacies, such as delta front underwater distributary channel, sheet sand, and interdistributary bay. On seismic sections, different microfacies are significantly different in waveform features, the underwater distributary channel is characterized by one trough between two peaks, while diversion bay exhibits chaotic reflections between T6 and T51. The sedimentary microfacies varied greatly during the depositional period of T3X51 in the Dongfengchang area, this is because that the sediment supply was mainly controlled by the southwest and southeast provenance regions. Three superimposed underwater distributary channels are developed in the Dongfengchang area. The phase-1 superimposed underwater distributary channel in the northwest transition to sheet sand in the northeast, the phase-2 superimposed underwater distributary channel in the south extends shortly, the phase-3 superimposed underwater distributary channel in the northeast has a large development scale. These research findings are helpful to guide the subsequent exploration of T3X5 gas reservoir and also theoretically significant for investigating the depositional evolution of the Xujiahe Formation in central Sichuan Basin.

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四川盆地东风场地区徐家河地层第 5 组沉积微地貌
四川盆地中部三叠系上统徐家河组(T3X5)第5层是近期勘探的一个新突破。然而,由于对这一新地层的基础地质研究不足,导致其沉积类型和沉积面分布不清,严重制约了其后续勘探评价工作的开展。本研究利用岩芯、测井和地震资料,通过岩芯观察和测井解释,明确了T3X5第一砂组(T3X51)的沉积微相类型,并根据地震波形特征和地震预测,确定了T3X51的沉积微相分布。结果表明,东风场地区的 T3X51 主要由三角洲前沿水下分布河道、片砂、间湾等几种微地层的三角洲沉积组成。在地震剖面上,不同微积层的波形特征明显不同,水下分流河道的波形特征为两峰之间有一槽,而分流湾则在 T6 和 T51 之间表现为混沌反射。东风场地区 T3X51 沉积期的沉积微地貌变化较大,这是因为沉积物的供应主要受西南和东南产地的控制。东风场地区发育有三条叠加的水下分布通道。一期叠加式水下分流河道在西北部向东北部片沙过渡,二期叠加式水下分流河道在南部延伸较短,三期叠加式水下分流河道在东北部发育规模较大。这些研究成果有助于指导T3X5气藏的后续勘探工作,对研究四川盆地中部徐家河地层的沉积演化也具有重要的理论意义。
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来源期刊
Petroleum Research
Petroleum Research Earth and Planetary Sciences-Geology
CiteScore
7.10
自引率
0.00%
发文量
90
审稿时长
35 weeks
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