Sandy Debris Flow Reservoir Prediction On The 1^st Member In Shahejie Formation Of Nanpu Sag No.3 Structure

Although there are several decades time on the study of the deep water deposition system,to those debris flow sedimentary systems which has a complicated sedimentary insider.Scholars now mostly apply the debris flow theory as the representation like Bouma sequence.While the numerous atypical deep water massive sandstone sedimentary in the core observation,couldn't be explained by the debris theory by now.Shanmugam and others call this as sandy debris flow,and they simulate gravity flow deposition process based on the flume experiment,clarifying the distinction between the sandy debris flow deposits and turbidite deposition same gravity flow from the aspect of rheology,and the new deep-water sedimentary theory is established.In recent years,under the numerous core observation of the 1^st Member in Shahejie Formation of Nanpu sag No.3 Structure,huge pure massive sandstone was found intermingled in the deep lake dark mudstone,erratics and mudstone tear could be often seen inside.It possesses the typical sandy debris flow sedimentary reservoir characteristics.Sandy debris flow is gradually becoming one the most potential exploratory target in the oil field as its component of sand is high,thickness of the monolayer is big,and close to the oil sources.In the present,the study of the sandy debris flow mostly focus on the study of deposition mode and theory,but little on the aspects of distinguishing and predicting the sandy debris flow seismic.It is necessary to have a further study on seismic reflection characteristics as well as reservoir spreading discipline.And this is the aim of the paper.On the basis of previous study,we have subtly explained the Nanpu sag No.3 Structure3-D seismics files in the beginning.Then we analysis sandy debris flow typical sedimentary characteristics developed in the Nanpu sag No.3 structure.Making core and logging calibration as the prerequisite,using the advantageous of well-log and seismic integration technique,we explicate the seismic reflection characteristics of the sandy debris flow and other sedimentary facies in the study area.On the foundation of this,we apply the Stratimagic waveform classification seismic phase plane automatic classification technology,we use seismic plane facies to divide the whole area,via the seismic facies-sedimentary facies time-to-space conversion,we know the discipline of sedimentary system plane distribution.Meanwhile,combined the relatively advanced technique called seismic attribute analysis technology,sensitive attribution optimizing selection is used in the sandy debris flow reservoir,applying the RGB multi-sensor fusion technology,an indicate description is working in the sandy debris flow reservoir plane distribution and inner details.Using era-meaning strata slice technique,we analysis the sedimentary system evolution of 1st Member in Shahejie Formation in the study area,then make sure the space distributing character of the sandy debris flow reservoir.By making the log-constraint inversion as a resort,we have effectively predicted the sand thickness and distribution discipline of sandy debris flow reservoir.Finally,we comprehensive the deposition,structure,sand distribution and work out the favorable advantageous lithology trap in the study area.Through the study in this paper,we basically clarify the Nanpu sag No.3 structure's sandy debris flow seismic reflection characteristics as well as reservoir spreading characteristics,we have preliminarily formed a complete series of working method of the sandy debris flow reservoir prediction and technique flow and consequently acquired a further cognizance on the study of the continental lake basin deep water deposition theory and exploration method in our nation.