Font Size: a A A

Method Study Of Lithologic Trap Forecasting Technique At Eastern1-1Region, Ying-Qiong Basin

Posted on:2012-01-11Degree:DoctorType:Dissertation
Country:ChinaCandidate:L H LiuFull Text:PDF
GTID:1220330377950414Subject:Earth Exploration and Information Technology
Abstract/Summary:PDF Full Text Request
The Huangliu group at Ying-Qiong Basin eastern13-1region is a new exploratory area and there are6well drillings that have been completed by2011. Three of them get industrial gas and are confirmed as typical lithologic trap oil and gas reservoir. But the target bed of the sedimentary system belongs to a new sedimentary type.So there are many problems not concluded. The change of inter-well reservoir is complex. Previous research considers that the porosity of channel sand body is big, but the permeability is low. Permeability forecast is the key factor forecasting oil deposit. Three of the bright spot sand bodies circled on the post-stack section in the previous research are true bright spot and three of that are false ones. The success rate of pre-stack inversion and other hydrocarbon testing techniques are low which have multiplicity of solutions. Aiming at the problems of lithologic trap forecasting above, this paper on the one hand develops the research content and technique idea of seismic sedimentology, on the other hand it inherits and develops the pre-stack hydrocarbon detection technique. Besides, this paper combines the two aspects, forming the technique system and application flow of reservoir seismology of reservoir prediction and material control oil reserve forecast which is applied in lithologic trap forecasting in this area. This application works well in actual production. This paper gets the following innovation achievements in academic research:(1)It develops the extract method of ancient landform property of Wheeler area, enriches the characterization technique of seismic geomorphology of seismic sedimentology, and lays the foundation of fine sedimentation analysis.(2)It, for the first time, develops a set of ideas and techniques of reservoir prediction(Wheeler inverse transformation) forecast which can use sand body carving of phase plane with quantitative control and quantitative retrieval to make profile sand body interpretation get sedimentary control. The sand body interpretated has genetic criteria which thus predicates its physical property.(3)It develops frequency demultiplication AVO oil and gas detection software, deletes multiple wave software and demultiplication AVO pre-stack attributes analysis software, actively develops hydrocarbon inspection technology that adapts to the feature of marine data.(4)lt combines the seismic sedimentology and prestack attributes for the first time which reflects the idea of "material control oil deposit" technology that realizes the integrated application of prestack-poststack and seismic-geology in reservoir lithology, physical property, and oil-bearing properties, thus forming the technical system of reservoir seismology that is successfully applied in eastern13-1area.This doctoral dissertation obtains the following achievements in terms of lithologic trap forecasting technique application at eastern1-1region:(1)Based on the regional sequence classification, reflectance signature of the seismic, and combine feature of living things, it reclassifies the first yellow part of subject reservoir into two level three sequence (SQ1、SQ2);It traces4level four seismic sequence (M1, M2, M3, M4) for the first time depending on the combine feature of living things,logging, features of seismic degrading channel.(2)It confirms the main layer M3in this region is atypical gravity flow deposit system based on the statistic analysis on area deposition, core, and the ratio of the width and depth of M3seismic channel.(3)It gets deposit control element of the main objective layer M3by using imaging logging and seismic geomorphologic map for the first time:paleocurrent control level four sequence grillwork, atypical clinoform background control ancient physiognomy and source supply style. Then it controls the regularity of distribution of sand body in the level four sequence.(4)It makes seismic deposit analysis on main layer M3. And it divides microfacies of filling channel, migration channel and degrading channel based on the seismic physiognomy of degrading channel for the first time. It also connects the microfacies division with reservoir permeability for the first time, considering that filling channel sand is of good permeability and it can match with prestack oil gas testing to improve the precision of oil and gas testing to form a set of forecasting technique system of material control oil deposit.(5)It uses phase-controlling forecast methods on the prestack part of M3and depicts many favourable sand bodies in the favourable microfacies area which lays the foundation of prestack hydrocarbon inspection.(6)It makes part of stack section by using prestack CRP gather to do frequency demultiplication processing on part of stack section and finds out that there is low frequency window phenomenon in fractional frequency AVO which matches with favourable deposit sand body in the plane.(7)It does multiple wave deletion on prestack gather and then uses trinomial AVO to collects the prestack nature of P, G, S and so on, and finds out the window feature of section P has more advantages to oil and gas inspection than poststack section. The absorption analysis on section P also improves the the oil and gas inspection precision, and matches with favourable deposit sand body in the plane. This puts forward the new idea of united hydrocarbon inspection on prestack nature and absorption analysis.
Keywords/Search Tags:seismic sedimentology, oil and gas exploration, sandstone of genetic type, reservoir by control of source, atypical gravity flow
PDF Full Text Request
Related items