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The Research On Sedimentary Microfacies And Forcasting Perspective Of Chang 10 Oil-bearing Of Yanchang Formation In Ansai Area

Posted on:2012-05-24Degree:MasterType:Thesis
Country:ChinaCandidate:H Y GeFull Text:PDF
GTID:2120330335993018Subject:Paleontology and stratigraphy
Abstract/Summary:PDF Full Text Request
Ansai area is in the south eastern of Shanbei Slope, which is rich in Mesozoic petroleum, but the exploration of deep oil-bearing series is still in a low level. Based on research and observation of outcrops and cores in Ansai area, many test analysis data were acquired, such as thin section determination, SEM, size analysis, physical property analysis, and well logging, testing information. With theories of stratigraphy, sedimentology, petroleum geology, stratum were delicately classified and correlated, sedimentary facies type were identified, sedimentary facies belt and sand distribution regularity were recovered, and physical property were studied. On above basis, Sedimentary microfacies of the Chang 10 oil-bearing of Yanchang Formation in Ansai area is deeply understood. Finally the favorable area were found out.According to the traditional division method, Chang 10 oil-bearing strata of this area was divided into three parts (Chang 101,Chang 102,Chang 103), and Chang 101 was subdivided into Chang 1011,Chang 1012-1,Chang 1012-2,Chang 1012-3,Chang 1013. Sever connecting-well section were built which to contrast the stratum. The papar established the Chang 10 subtle stratigraphic framework in the first time in Ansai area.Through the study of petrologic characteristics and electrofacies methods, this paper belives that the Chang 10 is identified to delta plain facies,including distributary channel,alluvial flat,natural levee and crevasse splay. The deltaic plain distributery channel sand body which has short of sideway continuity and vertical connectivity is good reservoir and mainly in Chang 1012-2. The sand bodies distribute from northeast to southwest dominated by sedimentary facies.The reservoir character of Chang 10 is with low-extremely low pore and low-ultra low permeability, which is apparently controlled by sedimentary facies and diagenesis, influenced by fractures in the pockets.Chang 10 belong to Lithologic and lithologic-structural oil pool in Ansai area. By multidisciplinary analysis, we think that the main controlling factors of oil-gas accumulation are sedimentation and tectonization. Based on the analysis of sedimentary facies, distributing regularity of sand body, the character of structure and prospecting program, the favorable area can be found out in Chang 10 oil-bearing beds which provide the credibility geology gist for further exploration and exploration in this area.
Keywords/Search Tags:Ansai area, Yanchang Formation, Chang 10 oil-bearing formation, sedimentary microfacies, subtle stratigraphic framework, Sand bodies distribution, Favorable area of oil and gas
PDF Full Text Request
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