The Genetic Mechanism and Model of Deep-Basin Gas Accumulation and Methods for Predicting the Favorable Areas

As a kind of abnormal natural gas formed with special mechanism, the deep-basin gas, accumulated in the lower parts of a basin or syncline and trapped by a tight reservoir, has such characteristics as gas-water inversion, abnormal pressure, continuous distribution and tremendous reserves. Being a geological product of the evolution of petroliferous basins by the end of the middle-late stages, the formation of a deep-basin gas accumulation must meet four conditions, i.e., continuous and sufficient gas supply, tight reservoirs in continuous distribution, good sealing caps and stable structures. The areas, where the expansion force of natural gas is smaller than the sum of the capillary force and the hydrostatic pressure within tight reservoirs, are favorable for forming deep-basin gas pools. The range delineated by the above two forces corresponds to that of the deep-basin gas trap. Within the scope of the deep-basin gas trap, the balance relationship between the amounts of ingoing and overflowing gases d     

一种有效的油气成藏研究手段——有机包裹体生物标志物分析：以渤海中部沙东南构造带为例

包裹体生物标志物分析实现了包裹体烃与储层烃的直接对比，是目前最有效的有机包裹体成分分析方法之一。由于一般情况下成熟早期原油密度较高，其中高分子量的生物标志物浓度亦高，因此，虽然该方法为群体包裹体分析结果，事实上包裹体生物标志物主要反映早期烃流体的特征，因而该方法可用于追朔油气成藏过程中石油组成的变化。本文详细介绍了压碎法包裹体烃生物标志物分析方法，并应用该方法分析了渤海中部沙东南构造带油气成藏过程。认为沙垒田凸起上CFD11-1油田的原油为沙河街组与东营组下段混合来源，其成藏过程是：早期沙河街组一段、三段形成的成熟度低到中等的油首先充注在近凹陷的构造中(如CFD18—2构造)，晚期(上新世时)东营组下段成熟油及沙河街组生成的高成熟油充注近凹的构造，并将早期注入的成熟度相对低的油向构造高部位排驱，排驱过程中有部分晚期生成的油气混合一起进入浅层，在远离凹陷的凸起上成藏(CFD11-1油藏)。作者认为，在近凹的低凸起及潜山构造是寻找轻质油和天然气的有利区带。     

Lake Sequence Stratigraphy of the Shahejie Formation in the Zhanhua Hollow, Shandong Province

Two sequences can be identified in the sedimentary strata of the lower Tertiary ShahejieFormation in the Zhanhua hollow. The lowstand, lake-transgressive and highstand systemstracts were formed under the control of ancient structure, palaeotopography, palaeoclimate, sed-iment supply, marine-transgression, and so on. In the paper the authors present a composite se-quence stratigraphical section of the Shahejie Formation in this area, and expound the bounda-ries of parasequences, parasequences set and systems tracts and evolutions of lake sequencestratigraphy and sedimentology and discuss various factors controlling the lake level fluctuation.The differences between lake and marine sequence stratigraphy are also indicated in the paper.The lake sequence stratigraphical study should be based on a synthetic analysis of structural evo-lution, palaeomagnetism, palaeoclimatic changes, geological Well logs, seismic and logging data,palaeontological data, global sea level changes, and so on. The sequence stratigraphical evolutionis closely related to the formation, development and elimination of the whole basin and thesedimentary process.     

Carbon and Strontium Isotopes of Late Palaeozoic Marine Carbonates in the Upper Yangtze Platform,Southwest China

238 marine carbonate samples were collected from seven sedimentary sections ofthe entire late Palaeozoic (Permian, Carboniferous and Devonian) in the Upper Yangtze Plat-form, southwest China. Based on the absence of cathodoluminescence and very low Mn (gener-ally<50 ppm) contents of the samples, it is thought that they contain information on the orig-inal sea water geochemistry. The results of isotopic analyses of these samples are presented interms of δ~(13)C and ~(87)Sr/~(86)Sr ratios versus geological time. The strontium data, consistent withother similar data based on samples from North America, Europe, Africa and other areas inAsia, support the notion of a global consistency in strontium isotope composition of marinecarbonates. The strontium data exhibit three intervals of relatively low ~(87)Sr/~(86)Sr ratios in thelate Middle Devonian to early Late Devonian, Early Carboniferous and Early Permian, corre-sponding to global eustatic high sea level stands. The lowest ~(87)Sr/~(86)Sr ratio recorded in theLate Permian was probably caused by substantial basalt eruptions in the Upper Yangtze Plat-form at the time. Three corresponding periods of relatively high δ~(13)C values at roughly the samethe intervals were caused by a relatively high rate of accumulation of organic carbon duringsea level rises at these times. The deposition of coal was probably responsible for the increaseof sea water δ~(13)C at other times. The δ~(13)C values drop dramatically near theDevonian/Carboniferous, Carboniferous/Permian and Permian/Triassic boundaries, con-sistent with other similar data, which further support the notion that geological time boundariesare associated with mass extinction and subsequent rejuvenation.     

小波变换在三维地震数据处理中的应用

近年来，小波变换作为一项理论在三维地震数据的处理中日益受到重视。本文利用小波变换的变焦特性及思想设计了一缩短地震波长、提高地震子滠主瓣与旁瓣幅度比的算法，并将此算法运用于胜利油田弧岛东斜坡Ｂ７０１井三维地震数据处理中。结果表明此算法对提高地层厚度分辨率是卓有成效的。     

GEOFEATURES AND RESOURCE ELEMENT COMBINATION OF TUMEN RIVER ECONOMIC GROWTH TRIANGLE

Ｉ.ＨｉｓｔｏｒｉｃａｌＡｓｓｅｓｓｍｅｎｔｏｎＴｕｍｅｎＲｉｖｅｒＧｒｏｗｔｈＴｒｉａｎｇｌｅＳｉｎｃｅｔｈｅｌａｔｅ1980ｓ,Ａｓｉａｈａｓｂｅｅｎｒｅｐｕｔｅｄｆｏｒｉｔｓｅｃｏｎｏｍｉｃｄｅｖｅｌｏｐｍｅｎｔ,ｅｃｏｎｏｍｉｃｇｒｏｗｔｈｔｒｉａｎｇｌｅｓｈａｖｅｅｍｅｒｇｅｄ.ＡｈｏｓｔｏｆｃｏｕｎｔｒｉｅｓｈａｖｅｊｏｉｎｅｄｈａｎｄｓｉｎＳｏｕｔｈｅａｓｔａｎｄｌａｔｅｒｉｎＮｏｒｔｈｅａｓｔＡｓｉａ.Ａｌｔｈｏｕｇｈｔｈｅｙａｒｅｓｔｉｌｌｉｎｔｈｅｉｎｃｉｐｉｅｎｔｓｔａｇｅ,ｔｈｅｙ…     

江西相山碎斑熔岩成因及其控矿作用的讨论

江西相山碎斑熔岩因其产状、岩石结构比较特殊,因此在岩石成因、岩相归属及岩体产状方面,长期以来存在多种不同看法。在控矿作用及找矿勘探方向看法上也有不同。作者通过多年野外地质、岩矿鉴定及矿床勘探资料的综合分析,从岩石学、岩石化学、地质产状上论证了相山岩体为一种介于火山与侵入之间的过渡性岩相—地下隐爆火山侵出相碎斑熔岩,具有一个主火山侵出通道和多个侧火山侵出通道的碎斑熔岩复式穹窿,其主、侧火山侵出通道机构及复式穹窿环锥状构造控制了矿田的格局及矿床和富矿体的生成部位。     

Composite Type Wind Wave Frequency Spectrum

Based on the P-M spectrum and improved theoretical wind wave frequency spectrum, this paper presents the composite type wind wave frequency spectrum, which is given by 2 pieces and satisfies 4 conditions: the spectrum peak passes through a given point; spectral area m0 and significant wave height H have the relationship H = 4.0 ; at the piecewise point, the values of spectrum and slope are contin-     

Study of Disconnectable Riser Turret Mooring System Applied in the South China Sea

- The present research has been made on the Disconnectable Riser Turret Mooring (DRTM) System which could be used in the oil fields of the South China Sea. The selection of the principal dimensions and their effect on the characteristics of the system have been discussed. By means of a computer program, the synthetical appraisement has been made in the ultimate mooring condition, disconnecting condition and reconnecting condition respectively. Mean-while, a comparison has been made between DRTM system and CALM system. It has been indicated that DRTM is suitable for the South China Sea and has technological and economical preponderance.     

On the Vibration Reduction Effect of Offshore Platform Vibration Distribution Structure

Based on the Bohai ocean environment characteristics, a new platform vibration distribution structure is designed to reduce the platform vibration due to flowing ice. The effect of the earthquake wave and ocean wave load on this vibration distribution structure is considered in the design. The principal idea of this new vibration distribution structure is dividing the platform main column into the inner tube and the outer tube. The outer tube is connected with the leg pontoon by braces, while the inner tube is used to support the platform deck. The inner tube and outer tube can be connected or disconneted in the region near the water line. For evaluating the vibration reduction effect of such a structure, tests are carried out on a steel model, and the external load of flowing ice, earthquake wave and ocean wave are simulated by concentated random load applied to different points of the model. The tests are performed in water media and air media respectively. The vibration reduction effect is evaluated