构型模式约束下深海水道连续性定量表征

Quantitative Characterization of Deep-sea Channel Continuity Under Architecture Model Constraints

刘飞 赵晓明 冯潇飞 曹树春 卜范青

LIUFei ZHAOXiaoming FENGXiaofei CAOShuchun BUFanqing

西南石油大学地球科学与技术学院, 四川 成都 610500 天然气地质四川省重点实验室, 四川 成都 610500 中国海洋石油国际有限公司, 北京 海淀 100028

School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China Sichuan Key Laboratory of Natural Gas Geology, Chengdu, Sichuan 610500, China CNOOC International Limited, Haidian, Beijing 100028, China

深海水道是沉积碎屑物质向深海盆地的重要运移通道及沉积场所，是深海沉积环境下主要储层类型。针对水道内部砂体结构样式及分布规律不明晰、储层连续性预测难度大等问题，开展了深海水道型储层连续性定量表征方法研究。研究以深海水道构型模式及表征结果为约束，将砂体横向与垂向叠置比例乘积倒数作为连续系数，并综合连续性与曲率的耦合关系，实现深海水道储层连续性分布模式的定量评价。研究取得以下认识：研究区单一水道构型分孤立型(Ⅰ型)、接触型(Ⅱ型)及嵌入型(Ⅲ型)3类，横向叠置比例区间分别为>1.00、0.85~1.00、<0.85，垂向叠置比例区间分别为>1.00、0.80~1.00、<0.80；连续系数区间为0.96~1.34、1.37~1.67以及1.67~2.56，Ⅰ型曲率分布在1.00~1.11，Ⅱ型分布在1.02~1.28，Ⅲ型分布在1.10~2.28，连续性随曲率增加而减小。研究量化了不同构型样式的连续系数及曲率分布范围，定量表征了单一水道砂体间的叠置关系，对于深海水道储层高效生产与精细开发有着重要的地质指导意义。

Deep-sea channels are important transportation channels and deposition sites for sedimentary debris to deep-sea basins, and they are the main types of reservoirs in deep-sea sedimentary environments. Aiming at the problems of unclear structural pattern and distribution pattern of sand body inside the channel, and the difficulty of predicting reservoir continuity, we have carried out a research on quantitative characterization method of reservoir continuity in deep-sea channel type. The study takes the deep-sea waterway configuration pattern and characterization results as the constraints, takes the inverse of the product of the lateral and vertical stacking ratio of the sand body as the continuity coefficient, and synthesizes the coupling relationship between the continuity and curvature to realize the quantitative evaluation of the distribution pattern of the continuity of the reservoirs in the deep-sea channel. The study achieves the following insights, the single channel configurations in the study area are divided into three types: isolated (Type Ⅰ), contact (Type Ⅱ), and embedded (Type Ⅲ), corresponding to lateral stacking ratios of >1.00, 0.85~1.00 and <0.85, and vertical stacking ratios of >1.00, 0.80~1.00 and <0.80, and continuity coefficients of 0.96~1.34, 1.37~1.67 and 1.67~2.56, type Ⅰ curvature distribution intervals of 1.00~1.11, type Ⅱ distribution intervals of 1.02~1.28, and type Ⅲ distribution intervals of 1.10~2.28, with continuity decreasing with increasing curvature. The study quantifies the continuity coefficients and curvature distribution ranges of different configuration styles, quantitatively characterizes the stacking relationship between single channel sands, and is of great significance as a geological guide for the efficient production and fine development of deep-sea channel reservoirs.

10.11885/j.issn.1674-5086.2024.08.28.01