乾西北地区青三段沉积微相与岩性油藏研究
发布时间：2018-10-14 12:48
【摘要】：以高分辨率层序地层学理论及其方法技术为指导,利用研究区岩心、测井、录井、试油及三维地震等资料,通过对各级次基准面旋回的分析与不同级次基准面旋回界面的识别,建立了松辽盆地南部乾西北地区青三段单砂体级高分辨率层序地层格架。在精细等时地层格架控制下分析了物源、沉积体系及沉积微相,并以此为基础开展乾西北地区青三段各小层沉积微相研究及单砂体识别。研究表明,本区极其复杂的油水分布并非受地层组、砂组、甚至小层,而是受单砂体控制,且其成为制约与认识qn3段油层的关键。乾西北qn3三角洲前缘砂体为北东向带状单砂体群,在明末构造局部反转形成上倾尖灭,并向两侧尖灭,顶部有局部泥岩盖层,具备大型岩性圈闭群及成藏有利条件。发现全区最主力油层25小层远砂坝砂体,及对长达20km、宽1000-2000m的大型带状远砂坝的预测,对下部勘探、开发具重大意义。同时指出目前勘探程度很低的研究区南部为有利潜力区,目的层应是qn3下部(Ⅻ、Ⅺ砂组),而不是目前东部主力探区的qn3中上部(Ⅶ、Ⅷ、Ⅸ、Ⅱ)地层。
[Abstract]:Guided by the theory of high-resolution sequence stratigraphy and its method and technology, using the core, logging, oil testing and 3D seismic data in the study area, the analysis of the cycles of subdatum levels and the identification of the interface of different order base-level cycles are carried out. The high resolution sequence stratigraphic framework of single sand body in the third member of Qingshan formation in the northwest of Qianbei area in the south of Songliao Basin is established. Under the control of fine isochronous stratigraphic framework, the provenance, sedimentary system and sedimentary microfacies were analyzed, and the sedimentary microfacies and single sand body identification of the third member of the Qingjiang formation in the northwest part of the Qianbei area were carried out on the basis of the analysis of the source, sedimentary system and sedimentary microfacies. The study shows that the extremely complex distribution of oil and water in this area is not controlled by stratigraphic formation, sand formation, or even small layer, but by single sand body, and it becomes the key to restrict and understand the formation of qn3 formation. The qn3 delta front sand body in the northwest of Qianbei is a northeastward zonal single sand body group. In the late Ming Dynasty, the local inversion of the structure formed an updip pinnacle, which was pointed out to both sides, with a local mudstone caprock at the top, with large lithologic trap group and favorable conditions for reservoir formation. It is found that the sand body of 25 small layers far sand bar in the most important oil layer in the whole area and the prediction of the large belt bar with a length of 20 km and a width of 1000-2000m are of great significance for the exploration and development of the lower part of the reservoir. At the same time, it is pointed out that the south of the study area with very low exploration degree is the favorable potential area, and the target layer should be the lower part of qn3 (XII, XI sand formation), rather than the middle and upper qn3 strata (鈪，
本文编号：2270502
[Abstract]:Guided by the theory of high-resolution sequence stratigraphy and its method and technology, using the core, logging, oil testing and 3D seismic data in the study area, the analysis of the cycles of subdatum levels and the identification of the interface of different order base-level cycles are carried out. The high resolution sequence stratigraphic framework of single sand body in the third member of Qingshan formation in the northwest of Qianbei area in the south of Songliao Basin is established. Under the control of fine isochronous stratigraphic framework, the provenance, sedimentary system and sedimentary microfacies were analyzed, and the sedimentary microfacies and single sand body identification of the third member of the Qingjiang formation in the northwest part of the Qianbei area were carried out on the basis of the analysis of the source, sedimentary system and sedimentary microfacies. The study shows that the extremely complex distribution of oil and water in this area is not controlled by stratigraphic formation, sand formation, or even small layer, but by single sand body, and it becomes the key to restrict and understand the formation of qn3 formation. The qn3 delta front sand body in the northwest of Qianbei is a northeastward zonal single sand body group. In the late Ming Dynasty, the local inversion of the structure formed an updip pinnacle, which was pointed out to both sides, with a local mudstone caprock at the top, with large lithologic trap group and favorable conditions for reservoir formation. It is found that the sand body of 25 small layers far sand bar in the most important oil layer in the whole area and the prediction of the large belt bar with a length of 20 km and a width of 1000-2000m are of great significance for the exploration and development of the lower part of the reservoir. At the same time, it is pointed out that the south of the study area with very low exploration degree is the favorable potential area, and the target layer should be the lower part of qn3 (XII, XI sand formation), rather than the middle and upper qn3 strata (鈪，
本文编号：2270502
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