Based on merged 3D seismic data, we conduct a study of stratighaphy, faults and structures in the Block X, South Turgay Basin, Kazakhstan. Using seismic attributes, we analyze amplitude anomalies of some layers. The following observations are obtained: A. A continuously developed uplift in the Paleozoic basement might be a preferable target for hydrocarbon migration; faults together with unconformity and permeable sandstones in the area form a nice dredge system for hydrocarbon. B. Adjacent to oil source and presented as high, buried hills with developed fractures in the basement may be favorable drilling targets. C. Structures or traps close to oil source at shallow depth may be also favorable targets for the future exploration.

基于哈萨克斯坦South Turgay盆地X区三维连片地震资料,对该区的地层、断裂及构造特征进行研究,应用地震资料的相干、振幅等属性,采用单层雕刻方式或时间窗限定雕刻方法对各层段的振幅异常进行了属性分析.分析后认为,在古生界基底结构基础上持续发育的隆起区,是油气运移的有利指向区,该区断裂发育,与不整合面以及渗透性砂岩共同构成了油气运移的良好疏导体系;指出落实可靠、地貌高、裂缝相对发育、近油源的基底潜山为有利的钻探目标;指出Mii砂岩段处于靠近油源位置、储层发育、埋藏较浅的构造或岩性圈闭为下步勘探的有利目标.

This paper briefly describes the principle of 90° phase data interpretation.Through the synthetic data we success to identify seismically thin beds in lithologic interpretation of 90° phase data,and describe the implementing procedure of 90° phase shift method.For real seismic data,we use the Wiener-Levinson mixed phase extraction method to estimate the seismic wavelet phase and use the phase shift method to convert the mixed phase to zero phase,and then convert to 90° phase.Finally we propose an idea to interpret thin beds by application of 90° phase data.Throughr the practical applications,we can confirm the advantage of 90° phase data in thin-bed interpretation.

On basis of the principle of the prestack elastic impedance inversion, we present in this paper an idea to predict gas-bearing reservoir using the prestack elastic impedance inversion. Firstly we calculate elastic impedance curves of traces near wells. Secondly we transform prestack seismic data from offset domain to angle domain. Thirdly we estimate seismic wavelets corresponding to different angles. Then we perform inversion to obtain elastic impedance sections. Finally we extract various elastic parameters. Applications of this prestack elastic impedance inversion to seismic data from Block A, Erdos Basin obtain good results, and demonstrate its feasibility and effectivity of gas-bearing reservoir prediction.

In view of multiple issues of prediction and evaluation for fractural dolomite reservoir with more porosity and permeability in Qingxi sag of a basin, the paper carried out study and analysis from the drilling, logging, seismic and geologic aspects, presented a set of technical tools suitable for the study of complex reservoir in the area, mainly including fine structural interpretation, core observation, imaging logging, seismic attributes analysis, seismic waveform analysis, integrative inversion and fractural model-building etc, gaining multiple analyzing graphics including map of fractural distribution in the area, and then carried out prediction of the developing area of fractural reservoir in the region, resulting in good effects.