柴达木盆地跃进地区干柴沟组沉积体系研究及有利砂体预测
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摘要
本文在前人研究基础上,充分利用现有的钻井、测井、地震及分析化验资料,以高分辨率层序地层学理论为指导,运用精细地层划分对比技术,分级建立研究区高精度三级层序地层对比格架;运用重矿物组合及古地貌发育特征确定物源方向;通过对重点井的单井相、连井相及平面沉积相的深入研究,划分沉积相类型,建立了测井-录井相与沉积相之间的对应关系及相模式。细致研究各三级层序沉积相和沉积体系展布规律并结合连井沉积相对比分析,深入刻画储层物性特征及其与沉积相的关系;在此基础上结合研究区典型岩性油气藏出油井跃73井的解剖分析,从三维立体角度预测研究区有利砂体可能展布方位。
本次研究明确了跃进地区古近系干柴沟组沉积具有稳定物源的特点。确定了该区干柴沟组时期主要冲积扇--辫状河--辫状河三角洲--湖泊(浊积扇)沉积体系。首次建立了跃进地区干柴沟组井-震统一的三级层序地层格架,并在等时地层格架下对该区干柴沟组砂体的分布进行了细致研究,结合研究区碳酸盐岩储集体的发育模式和沉积模式以及研究区E31平面沉积相和连井沉积相展布特点,提出E32晚期跃82井东侧两个相对隆起区为藻灰岩储集体有利分布区域,E31晚期跃东31井以东发育优质滩坝砂体。
This paper based on previous studies,by the full use of existing drilling, logging, seismic and laboratory data to high-resolution sequence stratigraphy theory as a guide, using fine stratigraphic subdivision and correlation technology, the establishment of the study area classification accuracy third-order sequence stratigraphic correlation framework;and the use of heavy minerals, stability factor and features of ancient landforms to determine source direction; through key well-depth study of sedimentary facies marks, divided into facies types, set up logging - Logging phase and the corresponding relationship between sedimentary facies and facies models. Detailed sequence of the three sedimentary facies and sedimentary systems and combined with the law well Sedimentary compared to the analysis, in-depth characterization of reservoir characteristics and the relationship between sedimentary facies; On the basis of the study area combined with the typical lithologic reservoir well and the anatomical analysis of 73 wells, from three-dimensional perspective,predict the orientation distribution of the sand of study area.
This study defined the Ganchaigou Paleogene stable source of sedimentary characteristics. Identified during the area Ganchaigou major and alluvial fan - braided - braided river delta - Lakes (slump fan) sedimentary system. For the first time established a region Ganchaigou well - a unified high-precision three seismic sequence stratigraphic framework, and isochronous stratigraphic framework in the area under the Ganchaigou sand distribution was carefully studied, depression combined with Zhaha Spring conditions of source rocks, seals, trap and preservation conditions of analysis, Yue-82 east of the two proposed wells relative uplift beneficial for the distribution of algal limestone reservoir area, Yue Dong 31 wells east of the development of high-quality beach bar sandstones.
本次研究明确了跃进地区古近系干柴沟组沉积具有稳定物源的特点。确定了该区干柴沟组时期主要冲积扇--辫状河--辫状河三角洲--湖泊(浊积扇)沉积体系。首次建立了跃进地区干柴沟组井-震统一的三级层序地层格架,并在等时地层格架下对该区干柴沟组砂体的分布进行了细致研究,结合研究区碳酸盐岩储集体的发育模式和沉积模式以及研究区E31平面沉积相和连井沉积相展布特点,提出E32晚期跃82井东侧两个相对隆起区为藻灰岩储集体有利分布区域,E31晚期跃东31井以东发育优质滩坝砂体。
This paper based on previous studies,by the full use of existing drilling, logging, seismic and laboratory data to high-resolution sequence stratigraphy theory as a guide, using fine stratigraphic subdivision and correlation technology, the establishment of the study area classification accuracy third-order sequence stratigraphic correlation framework;and the use of heavy minerals, stability factor and features of ancient landforms to determine source direction; through key well-depth study of sedimentary facies marks, divided into facies types, set up logging - Logging phase and the corresponding relationship between sedimentary facies and facies models. Detailed sequence of the three sedimentary facies and sedimentary systems and combined with the law well Sedimentary compared to the analysis, in-depth characterization of reservoir characteristics and the relationship between sedimentary facies; On the basis of the study area combined with the typical lithologic reservoir well and the anatomical analysis of 73 wells, from three-dimensional perspective,predict the orientation distribution of the sand of study area.
This study defined the Ganchaigou Paleogene stable source of sedimentary characteristics. Identified during the area Ganchaigou major and alluvial fan - braided - braided river delta - Lakes (slump fan) sedimentary system. For the first time established a region Ganchaigou well - a unified high-precision three seismic sequence stratigraphic framework, and isochronous stratigraphic framework in the area under the Ganchaigou sand distribution was carefully studied, depression combined with Zhaha Spring conditions of source rocks, seals, trap and preservation conditions of analysis, Yue-82 east of the two proposed wells relative uplift beneficial for the distribution of algal limestone reservoir area, Yue Dong 31 wells east of the development of high-quality beach bar sandstones.
引文
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[19]江波,司丹,王兰生等.柴西南地区油气成藏特征及有利储层预测,天然气工业,2004;24(9):8-10.
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[29] Galloway W E 1998, Clastic depositional system and sequences: applications to reservoir prediction, delineation, and characterization, Leading Edge, 1998, 17(2) :487-496.
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[31] Loucks , R G & J Frederick“Rick”Sarg (ed) Carbonate Sequence Stratigraphy Geological Society Special Publication No 104 London: GSUK Bookhouse, 1996.
[32]程日辉,王东坡.陆相层序地层学进展,岩相古地理,1996,16(4):56-60.
[33]郑荣才,彭军,吴朝容.陆相盆地基准面旋回的级次划分,沉积学报,2001,19 (2) :249-255.
[34]谢习龙,李思田.陆相盆地层序地层研究特点,地质科技情报,1993,12(1):22-24.
[35]薛良清.层序地层学在湖相盆地中的应用探讨,石油勘探与开发,1990, 17(6): 29-34.
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