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Selection And Evaluation Of Favorable Areas Of Yan10in Zhen250in Zhenyuan Oilfield Area Of Ordos Basin

Posted on:2014-09-01Degree:MasterType:Thesis
Country:ChinaCandidate:Y L LiaoFull Text:PDF
GTID:2250330401480944Subject:Mineralogy, petrology, ore deposits
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In recent years, oil exploration has achieved a great breakthrough in Yan10reservoirs in Zhen250area. The Yan10reservoirs is one of the newly discovered oil formations, the well test results showed that it has a huge potential of oil exploration in Yan10reservoirs. This thesis took the Yan10reservoirs of the Jurassic Yan’an formation in Zhenyuan area in Erdos Basin as the research object. Referring to a lot of regional geological data in the study area and absorbing the previous research results, based on coring observation and log data of the research area, combined with the filed profile, drilling and logging, the use of sedimentology and petroleum geology theory, characteristics of sedimentary systems, sedimentary facies, sand body morphology and distribution, reservoir characteristics and distribution of Yan10reservoirs of Yan’an formation in Zhen250area has been studied systematically. Above the basis, evaluating the reservoir is to lay the foundation for the next step in the exploration and development of oil reservoirs.The Zhen250area belongs to southwest of North Shaanxi Slope, and structural form is a west monoclinic dumping, whose local structure is located in the Qingyang of nasal fold belt. Complete structural traps do not appear in the entire range of the oilfiled. Yan10reservoirs are mainly controlled by palaeogeomorphology, sedimentation and diagenesis. Several nose uplifts, which developed on both sides of Tianhuan depression, allocated well with the Jurassic periods of sand body. Those are good points to the Jurassic reservoirs enrichment.In this paper, based on the core photos, log report and logging curve analysis, it has established the small layer isochronous correlation framework of the research area, confirmed the regional marker beds. Combined with the sedimentary cycles of the strata in the research area, single well stratigraphic division, connected wells isochronous contrast, based on stratigraphic section correlation, it established the unified isochronous stratigraphic framework, and the Yan10formation can be divided into Yan101, Yan102, and Yan103, totally three layers. In general, it makes clear that the direction of sedimentary thickness from the northeast to southwest gradually thickening and the sand distribution has good continuity.The Yan10reservoirs in Zhen250area mainly developed braid-river. It recognized channel microfacies, lateral margin microfacies, floodplain microfacies. The main channel sand body and lateral margin sand body developed. The Yan102sedimentary period is the main period of channel deposition construction. A plurality of branch channel distributed as dendritic and stripe forms in research area. The plane distribution is range and the characteristics of vertical distribution are obvious. The Yan10reservoirs in Zhen250area are mainly medium-fine feldspathic lithic sandstone, and belong to the low porosity and medium permeability. Intergranular porosity, feldspar dissolved pore developed; mesoporous-fine throat are the main pore structure. The early diagenetic compaction makes primary porosity worse. Under the erosion of dissolution to make the clastic particle form secondary pore. It greatly improves the reservoir property. The bad reservoir locally developed after calculate the reservoir score medium reservoir widely distributed.Referring classification standard of reservoir of Yan’an formation of the Erdos Basin, using SPSS statistical software to calculate the influence weight coefficient of single factor, Yan10reservoirs in the study area calculated score shows:the most favorable reservoir was located in Yan102layer, which was the exploration and extension in the future, and the main development measures output layer. This research adopted the volumetric method to calculate the three different kinds of the three layers; predicted geological reserves of Yan102were496.54×104t, predicted geological reserves of Yan10layers together was589.98×104t. Class1favorable block is only1and class Ⅱ favorable block4after selecting, a total of prediction of geological reserves of34.32×104.The resources of the study area is abundant; there will be more space for development.
Keywords/Search Tags:Yan10reservoirs, sedimentary microfacies, reservoir assessment, favorable areas prediction
PDF Full Text Request
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