基准面旋回控制下的浅水三角洲砂体分散体系特征

doi:10.7657/XJPG20230603

摘要/Abstract

摘要：

松辽盆地浅水三角洲油气藏发育，储集层预测难度大是制约该盆地油气勘探开发的重要因素。秉承地质-地震紧密结合的思想，基于高分辨率地震和高精度层序地层分析，利用地震90°相位转换、正演模拟、地震属性分析等技术，对松辽盆地杏西地区姚家组的层序地层、储集层地质-地球物理响应、砂体分散体系时空演化等方面开展了研究，并探讨了基准面变化对砂体分散体系展布的影响。研究结果表明：杏西地区姚家组可划分为2个中期基准面旋回，识别出3种岩性组合；在地震剖面上，中等厚度砂岩夹薄层泥岩的岩性组合对应强振幅，复合厚互层的岩性组合对应中等—强振幅，薄互层的岩性组合对应弱—中等振幅；基准面上升早期，浅水三角洲砂体分散体系平面上以朵状为主，上升中—晚期，逐渐过渡为退积式树枝状浅水三角洲，基准面下降早期，以加积-微弱进积式树枝状浅水三角洲为主，至下降中—晚期，砂体分散体系以坨状沉积体为主。

关键词: 松辽盆地, 杏西地区, 浅水三角洲, 砂体分散体系, 基准面旋回, 正演模拟, 岩性组合

Abstract:

Shallow-water delta reservoirs are developed in the Songliao basin, where the difficulties in reservoir prediction are restricting oil and gas exploration and development. Adhering to the idea of geology-seismology integration and based on high-resolution seismic survey and high-precision sequence stratigraphy, the Yaojia formation in the Xingxi area of the Songliao basin was investigated with respect to sequence stratigraphy, geophysical responses of reservoirs, and spatio-temporal evolution of sand body dispersion system by using the techniques such as 90° seismic phase conversion, forward modeling, and seismic attribute analysis, and the impact of base-level changes on the distribution of dispersion system was discussed. The results indicate that the Yaojia formation in the Xingxi area can be divided into two mid-term base-level cycles, with three identified lithological combinations. On seismic sections, the lithological combination of moderately-thick sandstones intercalated with thin mudstones corresponds to strong amplitudes; the lithological combination of composite thick interbeds corresponds to medium-strong amplitudes; and the lithological combination of thin interbeds corresponds to weak-medium amplitudes. In plane, the sand body dispersion system in the shallow-water delta primarily exhibited a lobe shape in the early stage of base-level rise, gradually transited into a retrogressive dendritic shallow-water delta in the middle-late stage of base-level rise, existed predominantly as progradational-weakly aggradational dendritic shallow-water deltas in the early stage of base-level fall, and appeared as lump-like deposits in the middle-late stage of base-level fall.

Key words: Songliao basin, Xingxi area, shallow-water delta, sand body dispersion system, base-level cycle, forward modeling, lithologi- cal combination

中图分类号:

TE112.221

赵春晨, 刘豪. 基准面旋回控制下的浅水三角洲砂体分散体系特征[J]. 新疆石油地质, 2023, 44(6): 657-666.

ZHAO Chunchen, LIU Hao. Characteristics of Sand Body Dispersion System in Shallow-Water Delta Controlled by Base-Level Cycle[J]. Xinjiang Petroleum Geology, 2023, 44(6): 657-666.

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