Dissertation > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Seismic exploration

The Seismic Facies Analysis and Application in LF Palaeogene Region

Author ZhuWei
Tutor NingSongHua
School Yangtze University
Course Earth Exploration and Information Technology
Keywords LF depression seismic facies seismic sequence multi-attributeanalysis
CLC P631.4
Type Master's thesis
Year 2013
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In recent years, with the of seismic exploration sector increase in the complexity of the objects of oil and gas development, seismic exploration technology along with rapid development. For oil and gas resources towards the development of more sophisticated and more practical goal. A geophysical staff is concerned, we want to get more underground information from the hands of the seismic data, in order to be able to be more accurate and true understanding of the underground physical properties, lithology, and fluid deposition, to improve oil and gas forecast the accuracy of help. Seismic faces appear on the reliability of the result of oil and gas exploration plays a very important role to some extent.In oil exploration, seismic data is very important; we generally get the deposition phase plane maps and we all hope a lot of wells on the region as many as possible, so it will be able to better analysis of sedimentary facies accuracy. But the fact is that enough drilling to be arranged in the economy is not appropriate, Seismic facies analysis methods appear to make up for a less well or wells exploration blocks, according to the characteristics of seismic facies parameters on the seismic profiles, in order to sedimentary facies prediction.This study block LF Depression the reservoir distribution characteristics, the main purpose of the work area of the target layer Enping Formation of Paleogene and Wenchang.There are few drilled wells in Enping and Wenchang block,so take full advantage of the good currently on seismic data, logging data, and lithology data closer integration of these information on the deposition phase in the horizontal and vertical on effective analysis, and further to predict reservoir.This article first compares the overall system analyzes the LF depression reservoir geological features, well logging of the curve response characteristics, the seismic response characteristics and stratigraphic framework for the establishment of a detailed description, after focusing clarify the conventional seismic facies analysis (also commonly known as the "physiognomy") of the basic principles and methods, under the guidance of the theory of sequence stratigraphy, seismic sequence learning, in order to better understand the area palaeogeomorphology, to make it more clear geological significance. In Seedcases Geoframe software modules and the LPM module for multi-attribute clustering analysis, test analysis of actual seismic data from a variety of parameters.How to identify and predict the reservoir effectively in the region remains the most critical issues of the reservoir study.In this paper, seismic facies analysis of qualitative research technology stratigraphic sequence stratigraphic studies based on the LF region, mode of rift basins cognitive interpretation of seismic facies is the tradition of the "physiognomy": according to the seismic facies flag, in the region of seismic profiles to find the structure of the various plot reflection before, to explain the main material source location and direction of flow, and then divided by the difference in amplitude, frequency and continuity based on seismic reflection wave phase District following the above steps, the interpretation of the results on the seismic facies classification and interpretation will profile conversion to the plane made seismic facies plane maps and seismic facies evolution analysis on the seismic section.After the study, the paper mainly reached the following conclusions:(1) The work area of Wenchang LF15depression identified six three sequences, the LF13depression identified four third-order sequence. Enping group identified four third-order sequences.(2) LF15the depression compared LF13depression more than development of the two sequences, respectively is ESQ1and ESQ6.(3) The Wenchang Formation sedimentary facies types include the rivers-Delta lacustrine nearshore subaqueous fan, fan delta and sublacustrine fan. Nearshore subaqueous fan distribution in ESQ1sequences, seismic facies characterized in weak amplitude continuous wedge-shaped the clutter reflective structure.(4) the Enping Formation of sedimentary facies type main delta facies and littoral and shallow lake. The seismic facies main strong amplitude in the weak continuous foreset reflection structure and weak amplitude continuous plate reflector structure.In short, the work area from the sequence ESQ1to ESQ10integrated a wide range of information-based seismic data analysis for wells drilled Enping Group To take full advantage of well data, seismic facies control, no wells drilled Wenchang Group To take full advantage of the large depositional environment and the rift basin deposition mode, as well as near the Sag constraints and reference, so that the understanding of the seismic facies macro control.

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