亚洲免费av电影一区二区三区,日韩爱爱视频,51精品视频一区二区三区,91视频爱爱,日韩欧美在线播放视频,中文字幕少妇AV,亚洲电影中文字幕,久久久久亚洲av成人网址,久久综合视频网站,国产在线不卡免费播放

        ?

        Research on Sesmic Attribute Reservoir Prediction Method: Taking the Shang Block 2 of Sanzhao Sag as an Example

        2019-08-05 09:23:28XUQi

        XU Qi

        [a]NO.10 Oil Production Plant, Daqing Oilfield Co. Ltd., PetroChina,Daqing, China.

        Abstract Block 2 is located at the northeastern end of the Sanzhao sag in the Liao Basin.The main oil layer is Fuyang oil layer.There is a problem that the sand body develops rapidly and the reservoir distribution is not clear. In order to solve the problem of modification, this paper uses the seismic attribute technique to analyze the lateral distribution characteristics of the reservoir in the Shang 2 block of the Sanzhao Sag in the study area. On the basis of establishing the forward modeling by ray tracing method, the influence analysis of mudstone interlayer thickness and sand-ground ratio forward analysis are carried out. The analysis results show that the sedimentary environment of the Fuyang oil layer is mainly the sub-facies of the delta diversion plain, which develops the diversion channel, the diversion bay and the mat-like sand microfacies,and the channel is mainly distributed in the eastward direction.

        Key words: Songliao Basin; Reservoir prediction;Forward Modeling; Seismic attributes

        INTRODUCTION

        Located at the northeastern end of the Sanzhao sag in the Songliao Basin,the Shang Block 2 is a nasal structure lying on the north of the Suihua sag and on the west of the Yushulin oil field. The main potential layer is the Fuyang oil layer, which are mainly composed of the delta front subfacies and the delta diversion plain subfacies.Since the Block was put into production, the overall development effect has been good. However, there still exist many problems such as rapid development of sand bodies and unclear distribution of reservoirs. Therefore, in this paper, the well-shock combined reservoir prediction work is carried out for the Shang Block 2 , and the geological characteristics of the study area are recognized.In oil and gas exploration (Hirsche, 1997; Jaradat, 2005),combining logging data and seismic data has become one of the most commonly used and important exploration techniques. With the popularity of 3D seismic technology in the early 1990s, a large number of new seismic attributes have emerged (eg dip, azimuth, coherence,azimuth difference, texture and spectral decomposition properties, etc.). A large number of exploration problems have been solved by the seismic attribute classification and clustering technology, pattern recognition technology,attribute analysis technology based on neural network as well as rapid development and large-scale application of various post-stack seismic inversion techniques,which fully demonstrated the importance of seismic reservoir prediction technology. Thus, in the process of predicting geophysical reservoirs in China, seismic attribute technology is usually used to analyze the lateral distribution characteristics of reservoirs (Liu, 2015), which provides reference for the deployment of well locations.

        1. SEISMIC ATTRIBUTE RESERVOIR PREDICTION

        In Yushulin oilfield, the reservoir characteristics of Shang Block 2 are characterized by rapid lateral change and large thickness. According to the principle of calculating the well division of Fuyu oil layer, the Fuyu oil layers in this area were divided into FI, FIIand FIIIoil layer groups.This paper has made full use of the seismic wave to coordinate the variation of amplitude and sand content.Moreover, in this paper, the relative spatial variation of seismic properties was applied to explain the spatial distribution of the reservoir.

        1.1 Forward Model Design

        In the process of seismic attribute analysis, the establishment of forward model becomes a key step.This study uses ray tracing to build a forward model.Although the ray tracing method can not simulate fullwavefield information, it can accurately calculate the earthquake travel time and amplitude value.The ray tracing process is to give a series of initial ray parameter values at the excitation point. According to Snell’s theory,the tracking is performed sequentially, and the two closest rays are selected near the receiving point. Through the interpolation, the initial ray parameter value is adjusted.After many adjustments and modifications, satisfactory results can be obtained.

        Due to the influence of the resolution of the collected seismic data, it is impossible to finely engrave the small layer of sandstone when using the seismic attributes to conduct and measure the reservoir.

        1.1.1 Analysis of the influence of mudstone interlayerAccording to the velocity and density parameters of the Fuyang oil layer in this area, five double sandstone wedge models with different sandstone thicknesses were designed for forward modeling (Figure 1, Figure 2).

        Figure 1 Mudstone compartment model of Block 2

        Figure 2 Seismic response characteristics of mudstone interlayer in Shang Block 2

        After extracting the amplitude values of each forward model, it was found that as the thickness of the sandstone increased, the thickness limit of the mudstone barrier decreased.( Figure 3)

        The equal-thickness interbedded sand body models of 1m, 2m, 3m, 5m and 8m were established. The forward modeling showed that with the increase of sandstone thickness, the seismic identification ability of single sand body was enhanced, and the thickness of the barrier layer was gradually reduced (Figure 4).

        When the thickness of the Fuyang oil layer in the Shang Block 2 is about 480m, the average thickness of the mudstone interlayer is 31.2m, and the thickness of the barrier layer required for the 1m thick sandstone is 18m.Therefore, it is considered that the interference between the sandstones in the study area is small and the intensity of seismic reflections can reflect changes in sandstone thickness.

        Figure 3 Analysis of sandstone mudstone interlayers with different thicknesses

        Figure 4 Variation table of mudstone interlayer in Shang Block 2

        1.1.2 Effect of Sand-Land Ratio

        Three sandstone models with different overlapping relationships were designed for forward modeling. The forward modeling results showed that under thin interbed conditions, their thickness was positively correlated with seismic amplitude whether sand bodies were regularly stacked or irregularly stacked. Therefore, the amplitude property can be used to predict the sandbody (Figure 5 to Figure 7).

        Figure 5 Wedge single sand body forward model

        Figure 6 Regular stacked sand body forward model

        Figure 7 Irregular stacked sand body forward model

        1.2 Qualitative Prediction of Sandstone

        To a certain extent, the magnitude of the seismic amplitude can reflect the variation of the sandstone thickness.Therefore, the amplitude attribute can be used to represent the lateral variation distribution of the sand body. For the 15 oil layers from FIto YIII, a qualitative prediction of the amplitude attribute in the sand body is carried out.The following are the sandstone prediction maps of some oil layers in the Shang Block 2 (Figure 8 & 9).From the figures, we can see that the sedimentary environment of the Fuyang oil layer is mainly the sub-facies of the delta diversion plain, which develops the diversion channel, the diversion bay and the mat-like sand microfacies. The river channels are mainly distributed in the northeast.

        e 8 Sand stone prediction ma p of FIreservoir group in shang block 2

        Figure 9 Sedimentary facies diagram of FI reservoir 1

        According to the well results and oil layer data, the comprehensive coincidence rate of seismic sand body prediction is 76.3%, and the comprehensive coincidence rate of sand bodies greater than 3m reaches 80.9%.Therefore, the seismic amplitude property can be used to accurately predict the lateral distribution of the sandstone in the Sang Block 2 of the Sanzhao sag, which can further understand the distribution of the sand body in the research area.

        CONCLUSION

        ? Seismic properties can qualitatively predict the distribution of sandstone.

        ? Using seismic attributes can accurately predict the lateral distribution of sandstone in the study area.

        ? The sedimentary environment of the Fuyang oil layer is mainly the subfacies of the delta diversion plain, which develops the diversion channel, the diversion bay and the mat sand microfacies.The river channels are mainly distributed in the northeast..

        老色鬼永久精品网站| 日韩一区二区三区久久精品| 亚洲国产日韩a在线乱码| 一性一交一口添一摸视频| 91av视频在线| 久久一二三四区中文字幕| 亚洲国产av一区二区四季| 国产精品嫩草99av在线| 久久ri精品高清一区二区三区| 激,情四虎欧美视频图片| 国产激情一区二区三区不卡av| 色综合久久无码五十路人妻| 国产精品va在线观看无码| 久久久亚洲精品蜜桃臀 | 日韩在线免费| 蜜桃av区一区二区三| 国产91色综合久久高清| 狼人香蕉香蕉在线28 - 百度| 亚洲精品456| 亚洲国产欲色有一二欲色| 自拍偷自拍亚洲精品第按摩 | 亚洲色欲色欲www| a级福利毛片| 亚洲中文乱码在线视频| 国产对白国语对白| 久久亚洲av成人无码国产| 日韩人妻无码精品系列专区无遮 | 偷拍偷窥在线精品视频| 狠狠躁18三区二区一区| 亚洲欧美精品aaaaaa片| 亚洲AV专区一专区二专区三| 不卡一区二区三区国产| 免费a级毛片无码av| 中文字幕AⅤ人妻一区二区| 国产在线观看免费不卡视频| 天天做天天爱夜夜爽毛片毛片| 亚洲欧美日韩精品久久亚洲区| 宅宅午夜无码一区二区三区| 久久国产精品一区av瑜伽| 国产乱国产乱老熟300部视频 | 亚洲国产精品成人久久av|