歧口凹陷歧南低斜坡沙三段物源体系及聚砂规律  被引量:3

Provenance System and Sandy Accumulation Regularity at Es_3 in Qinan Low-ramp of Qikou Sag

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作  者:张晶[1] 李双文[1] 袁淑琴[2] 冀虎山 刘娟娟[1] 

机构地区:[1]中国石油勘探开发研究院西北分院,甘肃兰州730020 [2]大港油田分公司勘探开发研究院,天津300280

出  处:《新疆地质》2015年第2期245-250,共6页Xinjiang Geology

基  金:国家油气重大专项(2011ZX05001-003-004);中国石油天然气股份公司重大科技专项(2008-030504)资助

摘  要:物源问题一度成为制约歧口凹陷歧南低斜坡沙三段油气勘探的焦点。在综合分析沉积期古地貌及沟谷展布特征、地震属性特征、碎屑颗粒组分、重矿物组合特征、砂体展布特征等资料基础上,探讨歧南低斜坡沙三段沉积时期物源体系特征及分布。结果表明:歧南低斜坡沙三段存在3大物源体系,其中,西部歧南水道物源体系延伸距离远,波及范围大,控制了歧南低斜坡沙三段沉积时期砂体的形成与分布。进一步研究表明,古物源与沉积体系具良好的空间配置关系。受歧南水道主物源体系控制,低斜坡发育辫状河三角洲前缘沉积,砂体分布具"埕宁隆起物源供砂,歧南水道沟槽输砂,物源体系-坡折带联合控砂"的内在机制。物源方向的确定对研究沉积体系展布、砂体分布及有利勘探区预测具重要意义。The oil and gas exploration of Es3 Formation in Qinan low-ramp area has been constrained by the issue of sediment provenance. This article discussed the provenance system characteristics of Es3 Formation in Qinan low-ramp by comprehensive analysis of paleo-geomorphology, seismic attribution, clastic particles component, heavy minerals combination,sandy conglomerate distribution. After analyzing all above, three provenance systems were identified in Qi-nan low-ramp of Es3 Formation.Moreover, the extension distance of western direction of Qinan groove provenance is long and the influence range is wide. The forming and distribution of sand bodies in Es3 Formation of Qinan low-ramp were jointly controlled by Qinan groove provenance system. The provenance has a good allocating relationship with the depositional system ,with the control of provenances, Qinan low-ramp is mainly developed braided river delta front . Sand distribution is controlled by the following mechanism:Chenning uplift source providing sand, Qinan groove trans-porting sand, paleo-provenance system and slope-break belt controlling sand.The study on the provenances has important significance for sedimentary system, sand body distribution and prediction of favorable exploration areas.

关 键 词:歧口凹陷 歧南低斜坡 沙三段 物源体系 聚砂机制 

分 类 号:P618.13[天文地球—矿床学]

 

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