| The Sulige gas field 36-11 well area is located in the north-central part of the Ordos Basin,which is on the slope of Shaanxi.The dip angle in the area is relatively small and the structure is relatively stable,and no large-scale fault activity has been observed.The main reservoir in the study area is the 8th member of the Lower Xiashihezi Formation.It is a tight sandstone reservoir with characteristics of extremely low porosity and ultra-low permeability.The reservoir is highly heterogeneous and the distribution of sand bodies is unclear.The establishment of a high-precision three-dimensional configuration model has become a necessary means to solve the contradictions in the development process.In view of the above issues,this paper selects the encrypted area of Well Area No.36-11 in Sulige Gasfield as the research object,adopts the ideas of analytic hierarchy process and pattern fitting to analyze the internal structure of the reservoir in the study area in detail,according to different geological configuration Graded quantitative characterization.The three-dimensional configuration model and the three-dimensional physical property model of the encrypted area in the Sulige gas field 36-11 were established,and the model was verified.Mainly achieved the following aspects of the results and understanding.(1)The sub-segment of the lower sub-section of H8 No.36-11 in the Sulige gas field is simple,the overall trend is that the northeast is high in the southwest,and the overall dip is less than 7o,and the structure is less undulating.(2)The sedimentary system of the braided river in the lower sub-segment of Su 36-11 H8 is a tight sandstone reservoir.The sand body is not equal to the effective sand body,and the distribution of the effective sand body is mainly controlled by the sedimentary microfacies(heart-bar dam).By using Google Earth software to measure modern depositional outcrops and establish a geological knowledge base,combined with Mijing network anatomical results to establish the sedimentary facies model of the study area.The length of the beach bar in the study area was 500 to 1200 m;the width of the beach bar was 300 to 600 m;the thickness of a single beach bar was 2 to 8 m;the aspect ratio was approximately 1:2;the aspect ratio was approximately 1:150.(3)The interface of sand bodies in the lower sub-segment of Su 36-11 H8 can be classified into 6 levels,in which the 3-5-level configuration interface controls the internal-level subsurface features,and the 3-level interface defines the internal interlayer of the accretion body.The range and level 4 interface define the spread of the accretion body,and the level 5 interface defines the sand body size of a single channel.The spatial distribution law of the 4th configuration geologic body is determined by the empirical formula and the well drilling method of the accretion body position method.(4)Based on the study of the structure and sedimentary facies,the internal deposition layer(the interface of the 3rd configuration)of the Xintanba was finely characterized,and the geometric parameters such as inclination,inclination,length,and thickness were statistically analyzed.The results showed that the deposition layer was deposited.The extension range is 200-500m,the thickness is mainly distributed in 0.1-0.3m,and the inclination is mainly distributed in 1~o-4~o.(5)The three-dimensional structural model,the three-dimensional reservoir configuration model and the reservoir physical model under the control of the three-dimensional configuration model in the sub-segment 8 of the Su 36-11 encrypted area were established.The reliability of the model was evaluated and the results showed that the geological model Higher degree of agreement with actual geological conditions... |
PDF Full Text Request