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The 3D seismic survey conducted in the Yushulin area was the one first ever used in Daqing Oilfield. The data collected from there have been elaborately interpreted (examined in considerable detail ) using INTERPRET - 22 system. And the analysis against 2D seismic data was made. An appreciable geological payoff yielded therefrom has been made. As a result, " the seismic pattern T2" , a highly controversa! problem existed in Songliao Basin for years has been satisfactorily solved. It indicates that there must...

The 3D seismic survey conducted in the Yushulin area was the one first ever used in Daqing Oilfield. The data collected from there have been elaborately interpreted (examined in considerable detail ) using INTERPRET - 22 system. And the analysis against 2D seismic data was made. An appreciable geological payoff yielded therefrom has been made. As a result, " the seismic pattern T2" , a highly controversa! problem existed in Songliao Basin for years has been satisfactorily solved. It indicates that there must be a fault . A bunch of minor faults and minor structures are discovered, which lay a sound foundation for ensuring the success rate of drilling. An improvement' of S/N ratio of deep reflection has been shown. Thus, a new approach being enable to resolve the "tough nut " encountered in deep seismic exploration within the basin is developed. Also, an overall study of the result produced from 3D survey furnishes us the possibility of getting acquainted with the established regularity of hydrocarbon accumulation in Yushulin area.

榆树林地区的三维地震勘探是大庆油田的第一次三维地震工作。所获资料采用INTERPRETⅡ解释系统作精细解释,并与二维地震资料进行对比分析,取得了显著的地质效果。解决了松辽盆地争论多年的“T_2地震结构”问题,表明它是断层的反映;发现了一批小幅度构造和小断层,为提高钻探成功率打下了良好的基础,提高了深层反射的信噪比,为解决盆地内深层地震勘探的难题提供了新的途径。三维地震勘探成果的综合分析,使我们对榆树林地区油气聚集的规律有了新的认识。

By use of the data of digital seismic survey through many special handlings and meticulous expla- nations, the details of the structures in Yangxin Series of Permian in Neijiang-Tongliang region are de- tected,and its fracture-vug-developed zones are laterally forecasted also in this paper. 9 exploratory wells were worked out using the forecasted results and the success ratio for exploring gas was 88.7%. Therefore,it is an important way to raise the prospecting success ratio by use of the structure data com-...

By use of the data of digital seismic survey through many special handlings and meticulous expla- nations, the details of the structures in Yangxin Series of Permian in Neijiang-Tongliang region are de- tected,and its fracture-vug-developed zones are laterally forecasted also in this paper. 9 exploratory wells were worked out using the forecasted results and the success ratio for exploring gas was 88.7%. Therefore,it is an important way to raise the prospecting success ratio by use of the structure data com- bining with the forecasted results of fracture-vug zone to dispose exploratory wells.

本文利用数字地震勘探资料进行多种特殊处理和精细解释,查明了内江~铜梁地区二叠系阳新统的构造细节,并对其缝洞发育带进行了横向预测。用预测成果拟定了9口探井,获气成功率达88.7%。因此,用构造与缝洞带预测成果相结合部署探井,是提高勘探成功率的重要途径。

Detailed interpretation of three dimensional seismic data can be accomplished on LandMark Ⅳ interpretation system by fully using and developing multitudinous functions. Illustrated detailedly are some methods for the fault interpretation in seismic sections , the reasonable correlation of faulting points, the examination of fault interpretation result and the analysis of fault sealing ability, etc. In section interpretation, fault surface is considered as steep reflection horizon. In addition, Seismic attributive...

Detailed interpretation of three dimensional seismic data can be accomplished on LandMark Ⅳ interpretation system by fully using and developing multitudinous functions. Illustrated detailedly are some methods for the fault interpretation in seismic sections , the reasonable correlation of faulting points, the examination of fault interpretation result and the analysis of fault sealing ability, etc. In section interpretation, fault surface is considered as steep reflection horizon. In addition, Seismic attributive sections should be fully used to comprehensively analyse faults and to check if the fault interpretation is reasonable. Fault strike projection technique is employed so as to avoid unreasonableness due to subjectivity. The utilization of fault throw contours on strike projection plane favours analysing both the reasonableness of fault point correlation and the fault genesis. Projecting the fault points in upthrow and downthrow sides onto the strike projective plane faciliates the analysis of fault seal ability.

在LandMark Ⅳ解释系统上,充分运用和开发多种功能,可以实现三维地震资料的精细解释。文中以断层解释为例,详细地介绍了断层的剖面解释、断层组合方案的判别、断层解释结果的检验以及断层侧向封堵的分析等方法。在断层的剖面解释中,把断面作为大倾角反射层解释。此外,要充分利用地震属性剖面,对断层进行综合分析和检验断层解释的合理性。为了克服断层组合中的主观随意性,利用了断层走向投影技术。利用断层走向投影面上的落差等值线图,既可判断断层组合的正确性,又可以判断断层的成因。把断层上、下盘反射层的断点投影到断层走向投影面上,可实现断层的侧向封堵分析。

 
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