哈萨克斯坦Marsel探区下石炭统高频层序地层特征与沉积演化

发布时间：2018-06-11 20:06

本文选题：哈萨克斯坦 + Marsel探区　；参考：《古地理学报》2017年05期

【摘要】：根据Gr值、TH/U值和成像测井等测井资料,以及岩心、薄片等反映沉积基准面和沉积相变化的资料,在哈萨克斯坦Marsel探区下石炭统碳酸盐岩台地内划分出18个高频层序(四级层序),其中杜内阶和维宪阶高频层序界面类型主要为瞬时加深淹没间断面,谢尔普霍夫阶高频层序界面类型主要为瞬时暴露间断面。高频层序一般厚十几米至几十米,杜内期—维宪早期厚度较薄且差异不大,维宪中晚期—谢尔普霍夫期厚度差异增大,最终使下石炭统整体呈西薄东厚、北薄南厚的特征。杜内—维宪早期高频层序下部主要发育蒸发o_湖和局限o_湖亚相,上部主要为局限潮坪亚相;维宪中晚期—谢尔普霍夫期高频层序下部主要发育局限潮坪亚相,向上变为蒸发潮坪和台内浅滩亚相。通过对高频层序的成因分析认为,周期性高频海平面升降变化和气候是高频层序发育的主控因素,气候对维宪晚期—谢尔普霍夫期高频层序发育的影响更大。Marsel探区在早石炭世位于镶边台地内部,先后经历了早期(杜内期)局限台地—蒸发台地、中期(维宪期)局限台地—蒸发台地和晚期(谢尔普霍夫期)开阔台地—局限台地—蒸发台地这3期沉积演化过程。高频层序的研究为建立高精度层序地层格架和有利储集层的精细划分、对比及预测奠定了基础。
[Abstract]:According to the values of Gr, TH- / U, imaging logging and other logging data, as well as the core, thin slice and other data reflecting the change of sedimentary datum and sedimentary facies, In the lower Carboniferous carbonate platform of Marsel exploration area, Kazakhstan, 18 high-frequency sequences (Quadrature sequence) have been divided, in which the interfacial types of high-frequency sequences of Dune and Weixian are mainly instantaneous deepening submerged discontinuities. The main types of high frequency sequence interface in the Scherphoff order are transient exposure intersections. The high frequency sequence is usually more than 10 meters to several tens meters thick, and the thickness of the Dune period to the early stage of Weixian is thin and the difference is small, and the thickness difference of the middle and late period of the Weixian to the Sherphoff period increases, which finally makes the lower Carboniferous series as a whole with a thickness of west thin east and north south thick. The lower part of the high frequency sequence mainly developed evaporative olake and limited olake subfacies, the upper part was mainly confined tidal flat subfacies, and the lower part of the high frequency sequence mainly developed limited tidal flat subfacies in the middle and late period of Weixian to Scherphoff period, and the lower part of the high frequency sequence in the middle and late period of Weixian developed limited tidal flat subfacies. Up to the evaporative tidal flat and subfacies of the shoal in the platform. By analyzing the cause of formation of high frequency sequence, it is concluded that periodic high frequency sea level fluctuation and climate are the main controlling factors for the development of high frequency sequence. The influence of climate on the development of high-frequency sequences in the late Weixian and Schaphov period is greater. The Marsel exploration area is located in the edge terrace in the early Carboniferous, and has experienced the early stage (Dune period) limited platform and evaporation platform, and the Marsel exploration area is located in the early Carboniferous. The sedimentary evolution processes of the three periods are limited platform-evaporation platform and late stage (Shephov period) open platform-limited platform-evaporation platform. The study of high-frequency sequences lays a foundation for the establishment of high-precision sequence stratigraphic framework and the fine division, correlation and prediction of favorable reservoirs.
【作者单位】：中国地质大学(北京)能源学院;中国地质大学(北京)海洋学院;洲际油气股份有限公司;
【基金】：国家重点基础研究发展计划(973)项目(编号:2011CB201100-03) 中央高校基本科研业务费专项资金(编号:2652015362)联合资助~~
【分类号】：P618.13

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