O V E R S E A E X P L O R A T I O N 66

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10 C H I N A P E T R O L E U M E X P L O R A T I O N Technology Study of Non-Surface Consistent Static Correction/Wu Wenxi, Liang Chunyan, Yang Wenbin, Li Quansheng, Wen Yihua, Zhu Meiqin, Gou Dizhang//PetroChina Tuha Oilfield Company, Hami City, Xinjiang Uygur Autonomous Region Abstract: Static correction is always a key issue for land seismic exploration, so whether the static correction is right or wrong can exert direct effect on the quality of seismic data processing. The problem of static correction gets especially prominent in the seismic exploration of the rough mountainous region in western China. So the surface consistency hypothesis and the horizontal layered model hypothesis are not correspondent with actual geological conditions. There will exist a major error by using the method of surface consistent static correction. In this paper, several non-surface consistent static correction methods are proposed, including the static correction method by using floating datum, the method of surface model static correction by wavefield continuation, the method of smooth static correction. As a result, the signal to noise ratio is increased and better results are obtained. Key words: non-surface consistency; floating datum; static correction Exploration Technology of Lithologic Reservoir in Putaogou Zone in Taibei Sag in Turpan-Hami Basin and Its Effect Analysis/Guo Xiang 1, Lin Mingqiang 2, Hu Zhengtao 1, Chen Hua 1 //1.CNPE BGP Urumqi Branch, Urumqi City, Xinjiang Uygur Autonomous Region ; 2. Exploration Department of PetroChina Tuha Oilfield Company, Hami City, Xinjiang Uygur Autonomous Region Abstract: The Taibei sag is changed by the tilting action of late structural movement, so the structure of lithologic reservoir is formed. The prediction of lithologic traps gets very difficult due to the vertical distribution of thin interbeded layers of sandstone and mudstone which are the major target strata in middle Jurassic formation of Putaogou zone, the sharp horizontal phase change, and the small difference of wave impedance characteristics between sandstone and mudstone. This paper makes an effective prediction and evaluation of the growth conditions of lithologic traps and reservoirs in the process of exploration, based on the technologies including sequence stratigraphy, sedimentary microfacies study, lithologic logging curve rebuilding inversion, seismic attribute analysis, the absorption analysis of seismic wavelet. Through the research of the exploration technology for years, rich hydrocarbon accumulation zones of structure and lithologic reservoirs in Putaogou zone are found. Key words: fault; lithologic reservoir; seismic attribute; liquid detection; sand body; Turpan-Hami Basin; Putaogou zone Prospect of the Application of Data Mining in Petroleum Exploration Databases/Shi Guangren//Research Institute of Petroleum Exploration & Development, PetroChina, Beijing Abstract: This paper indicates through worldwide analysis that the application of data mining (DM) in petroleum exploration databases is in the initial stage. It briefly describes the structures, functions, algorithms and key techniques of data mining based on the work of pioneer contributors. A case study of well-logging interpretation introduces the processes, methods and application results of DM in concrete terms, proving that the DM used is feasible and practical. In the case study, multiple regression analysis is adopted as a dimension-reduction algorithm, while artificial neural network and support vector machine are employed as mining algorithms for knowledge discovery. Since a great number of petroleum exploration databases (including databanks and datastores) have been or will be built in China, it is time to further develop the techniques of DM that will become powerful tools for petroleum geology research and exploration decision. Key words: data mining; knowledge discovery; generalized database; dimension-reduction algorithm; mining algorithm; petroleum exploration; fracture prediction Primary Types of Sedimentary Basins and Petroleum Geological Characteristics of Typical Basins in Latin America/Xie Yinfu, Zhao Mingzhang, Yang Fuzhong, Wei Chunguang//Research Institute of Petroleum Exploration and Development, PetroChina, Beijing Abstract: The basins in Latin America are divided into such types as forearc basins, foreland basins, passive margin basins, intracratonic basins, etc.. Taking the Maranon and Campos basins as examples, this paper discusses the petroleum geological characteristics of the uppermost petroliferous basins- --foreland basins and passive margin basins. In Maranon Basin, source rocks in the Cretaceous Chonta Formation and the Triassic-Jurassic Pucara Group, the reservoirs in the Chonta Formation and the Vivian Formation, and the mudstone in the Chonta Formation and Paleogene Cachiyacu Formation make up favorable source-reservoir-cap assemblages. The sandstone in the Lower-Cretaceous Cushabtay Formation with high porosity and high permeability and the active faults provide efficient pathways for oil and gas migration. The intense salt movement of the Campos Basin plays a crucial role in the process of migration and accumulation of oil and gas. Oil and gas, generated by the Lower Cretaceous Lagoa Feia Formation, migrates to overlying turbidite reservoirs through salt windows. It finally accumulates in the structural traps or structural-stratigraphic traps after fault and unconformity communication. Key words: Latin America; type of Basin; Maranon Basin; Campos Basin; petroleum geological characteristics; exploration potential

( 1) ; 6 5 [ 3 ] S1 S2 1 Fig. 1 Seismic sequence prof ile framework of Wuliyasitai Sag S1 () ( 2) S2 ( ) Ο 2 S1 Fig. 2 Sedimentary fa

( 1) ; 6 5 [ 3 ] S1 S2 1 Fig. 1 Seismic sequence prof ile framework of Wuliyasitai Sag S1 () ( 2) S2 ( ) Ο 2 S1 Fig. 2 Sedimentary fa 27 3 2006 5 ACTA PETROL EI SIN ICA Vol. 27 No. 3 May 2006 : 0253Ο2697 (2006) 03Ο0027Ο05 1 2 2 2 (11 610059 ; 21 062552) : 2 ; : ; ;; ;; : TE1111 3 : A Forming pattern and distribution features of hydrocarbon