浅海重力流储层沉积模式新认识
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摘要
D气田黄流组一段为浅海陆架背景下的海底扇沉积,沉积微相平面展布复杂,储层具有很强的非均质性。开展沉积机理研究,对于厘清海底扇沉积微相展布、预测砂体展布具有重要意义。通过压实校正恢复古地貌,基于粒度标准偏差开展了水动力分析。随后,在综合分析古物源、古地貌、古水深、古水动力等特征基础上,明确浅海重力流沉积物的搬运作用明显受到坡折带、洼陷、沟谷等地貌的控制,并建立了先成洼陷限制性重力流充填-溢出、斜坡坡折下侵蚀-充填-分流、平缓斜坡非限制性漫流3种浅海海底扇沉积模式。
Submarine fan deposition is developed under the background of shallow shelf in D Gasfiled. The distribution of sedimentary micro-facies and the heterogeneity of reservoir is complex. The study of sedimentation mechanism has important implications for clarifying micro-facies distribution and predicting sand bodies. This paper reconstructs paleo-geographic environments through compaction correction and analyzes paleo-hydrodynamics based on deviation of granulometry. Comprehensive analysis of ancient sources, paleo-geography, paleo-water depth and paleo-hydrodynamics clarifies that the handling of gravity flow sediments in the shallow water is obviously controlled by various landforms such as slope break belts, depressions, and valleys. Based on the above study,three types of shallow submarine fan sedimentation model are established: restrictive gravity flow filling-overflow model in pre-depression, gravity flow erosion-filling-shunting model under slopebreak, and non-restrictive overflow model on flat slopes.
Submarine fan deposition is developed under the background of shallow shelf in D Gasfiled. The distribution of sedimentary micro-facies and the heterogeneity of reservoir is complex. The study of sedimentation mechanism has important implications for clarifying micro-facies distribution and predicting sand bodies. This paper reconstructs paleo-geographic environments through compaction correction and analyzes paleo-hydrodynamics based on deviation of granulometry. Comprehensive analysis of ancient sources, paleo-geography, paleo-water depth and paleo-hydrodynamics clarifies that the handling of gravity flow sediments in the shallow water is obviously controlled by various landforms such as slope break belts, depressions, and valleys. Based on the above study,three types of shallow submarine fan sedimentation model are established: restrictive gravity flow filling-overflow model in pre-depression, gravity flow erosion-filling-shunting model under slopebreak, and non-restrictive overflow model on flat slopes.
引文
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[2] 孙国桐.深水重力流沉积研究进展[J].地质科技情报,2015,34(3):30-36.
[3] 谢玉洪,范彩伟.莺歌海盆地东方区黄流组储层成因新认识[J].中国海上油气,2010,22(6):354-386.
[4] 钟泽红,刘景环,张道军,等.莺歌海盆地东方区大型海底扇成因及沉积储层特征[J].石油学报,2013,34(增刊2):102-111.
[5] 谢玉洪,王振峰,解习农,等.莺歌海盆地坡折带特征及其对沉积体系的控制[J].地球科学:中国地质大学学报,2004,29(5):569-574.
[6] 裴健翔,陈杨,郝德峰,等.莺歌海盆地中央坳陷中新世海底扇识别及其形成控制因素[J].东北石油大学学报,2016,40(5):46-52.
[7] 刘峰,裴健翔,汪洋,等.古地貌对海底扇沉积过程的控制及与油气富集的关系[J].中国海上油气,2015,27(4):36-45.
[8] 向淑敏,魏刚,李建平,等.渤东凹陷古近系沙三段构造-古地貌对沉积的控制[J].大庆石油地质与开发,2010,29(3):18-21.
[9] 黄银涛,姚光庆,周锋德,等.莺歌海盆地黄流组浅海重力流砂体物源分析及油气地质意义[J].地球科学,2016,41(9):1526-1537.
[10] 刘付程,张存勇 ,彭俊,等.海州湾表层沉积物粒度的空间变异特征[J].海洋科学,2010,34(7):54-58.
[11] 孙洪亮,黄卫民.北部湾潮汐潮流的三维数值模拟[J].海洋学报,2001,23(2):1-8.
[12] 俎婷婷.北部湾环流及其机制的分析[D].青岛:中国海洋大学,2005.
[13] 操应长,王健,刘惠民.利用环境敏感粒度组分分析滩坝砂体水动力学机制的初步探讨[J].沉积学报,2010,28(2):274-283.
[14] 孙有斌,高抒,李军.边缘海陆源物质中环境敏感粒度组分的初步分析[J].科学通报,2003,48(1):83-86.