琼东南盆地中中新统古沟谷和坡折带特征及油气勘探意义

发布时间：2018-01-25 05:48

本文关键词： 古沟谷坡折带海底扇乐东凹陷陵水凹陷中中新统琼东南盆地　出处：《油气地质与采收率》2017年03期 　论文类型：期刊论文

【摘要】：根据地震、录井和测井等资料,利用沉积相识别、古地貌恢复等方法,分析琼东南盆地中中新统古沟谷和坡折带的发育特征、分布规律及其对沉积的控制作用,探讨在其背景上发育的岩性油气藏的成藏条件和分布规律。研究结果表明:研究区发育"V"型、"U"型及宽缓碟型3类古沟谷,乐东凹陷和陵水凹陷北坡易形成"V"型或"U"型古沟谷,宝岛凹陷北坡发育宽缓碟型古沟谷;坡折带可分为沉积坡折带、断裂坡折带和挠曲坡折带3种类型,乐东凹陷和陵水凹陷北坡发育沉积坡折带,陵水凹陷和松南凹陷北坡发育断裂坡折带,宝岛凹陷北坡发育挠曲坡折带。不同类型坡折带对沉积具有差异性控制作用,表现为乐东凹陷和陵水凹陷北坡发育受沉积坡折带控制的大型富砂海底扇,是研究区主要的储层,该沉积时期水动力强、发育规模大、粒度粗、物性较好;断裂坡折带对陵水海底扇沉积的控制作用表现在断层下降盘发育朵叶复合体等有利沉积微相;挠曲坡折带控制宝岛凹陷发育的海底扇沉积,该沉积时期水动力较弱、粒度细、物性较差。综合分析认为,乐东凹陷和陵水凹陷北坡坡折带是岩性油气藏发育的有利区带,是下一步深水勘探的重要区域。
[Abstract]:According to the seismic, logging and logging data, the sedimentary facies identification, palaeo geomorphology restoration method, analysis of the Miocene Qiongdongnan Basin in ancient gully and slope belt development characteristics, distribution and control on sedimentation, to explore lithologic development in the background of gas accumulation conditions and distribution the law. The results show that the study area developed "V" type, "U" type and relief disc type 3 ancient Valley, Ledong sag and the north slope of Lingshui sag is easy to form a "V" or "U" type of ancient Valley, island wide and slow development the north slope of the sag dish ancient gully slope belt can be divided; sedimentary slope belt, fault slope belt and flexure slope break of 3 types, Ledong sag and Lingshui sag north slope development sedimentary slope belt, Lingshui sag and Songnan sag developed in the north slope of the fault slope break zone, the north slope of the sag Island Development flexure slope break. Different types of slope belt has the effect of the difference of control for deposition, For Ledong sag and Lingshui sag north slope development by large sand rich sedimentary slope belt control, is the main reservoir of study area, the depositional period of water power development, large scale, coarse granularity, good physical property; fracture slope on Lingshui submarine fan deposition control action in fault the development of downthrown lobe complexes and other favorable sedimentary microfacies; with the development of control Baodao sag submarine fan flexure slope break, the depositional period of weak water power, fine granularity, poor physical property. Comprehensive analysis shows that the northern slope of Ledong sag and Lingshui sag belt is the favorable area of lithologic reservoir development zone. Is an important area of deep water exploration in the next step.

【作者单位】：中海石油(中国)有限公司湛江分公司;
【基金】：国家科技重大专项“莺琼盆地高温高压天然气富集规律与勘探开发关键技术”(2016ZX05024-005)
【分类号】：P618.13
【正文快照】： 在陆相或海相盆地的油气勘探中,随着构造油气藏发现概率的递减,应用坡折带理论预测沉积体系分布、寻找岩性油气藏已成为研究热点,并取得了良好的实用效果[1-5]。在渤海湾和松辽盆地建立了陆相湖盆坡折带“控砂—控藏”油气成藏模式,成功预测了湖相沉积砂体和油气藏分布规律[6-

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