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This paper deduces the expression of the Schottky contact capacitance of AlGaN/AlN/GaN high electron mobility transistors (HEMTs), which will help to understand the electron depleting process. Some material parameters related with capacitance--voltage profiling are given in the expression. Detailed analysis of the forward-biased capacitance has been carried on. The gate capacitance of undoped AlGaN/AlN/GaN HEMT will fall under forward bias. If a rising profile is obviously observed, the donor-like impurity or trap is possibly introduced in the barrier. 相似文献
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大庆长垣南部浅层气主要为来源于嫩江组一二段的生物气,混入少量的青山口组热成因气和无机成因的CO2.明水组沉积末期为嫩江组一二段大量生排生物气时期,此时断裂活动导致黑帝庙油层背斜和断圈的形成,并诱导生物气垂向运移,三期复合使大量生物气向黑帝庙油层运移.活动断层均为断裂密集带的边界断层,沿其垂向运移的生物气聚集的部位取决于断层与两盘地层的配置关系,与断层倾向相反的一盘是生物气聚集的主要部位,大庆长垣南部总体为西缓东陡的不对称背斜,生物气主要富集在断裂密集带东部边界的圈闭中.黑帝庙油层纵向上分为5套储盖组合,下部3套组合盖层厚度较大,受断层错断的概率较小,是主要的目的层.黑帝庙油层大部分圈闭为断圈,断层侧向封闭性决定圈闭的潜力,断层侧向封闭所需SGR低限为0.375,利用Allan图解标定断层侧向封闭性并分析圈闭的潜力,与不考虑断层侧向封闭性时圈闭有3种变化:一是断层侧向封闭,面积和幅度没有改变的圈闭(Ⅰ型);二是断层侧向封闭具有分段性,面积和幅度变小的圈闭(Ⅱ型);三是断层侧向不封闭,不存在的圈闭(Ⅲ型).其中Ⅰ和Ⅱ型圈闭是生物气聚集的有利目标.从大庆长垣南部看松辽盆地浅层气成藏关键因素是有沟通气源的断层控制的圈... 相似文献
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YANG Keming 《《地质学报》英文版》2008,82(6)
The foreland basin in West Sichuan is a tectonic unit that has undergone multi-periods tectonic movements of Indosinian-Yanshanian-Himalayan. Since late Triassic, it has been in a passive subsidence environment controlled by basin margin mountain systems and by the compression with abundant sediment sources. With the complex geologic setting, the main geologic characteristics of natural gas reservoir are listed as following:(1)Source rocks are coal-bearing mud and shale series with high to over maturity, and long and progressive hydrocarbon generation-displacement period. The key accumulation period is middle-late Yanshanian epoch.(2)There are three gas-bearing systems vertically, each of which has different reservoir mechanism, main-controlled factors and distribution law, so the exploration thoughts and techniques are also different.(3)Undergoing multi-period generation-migration-accumulation, oil and gas have encountered multi-period modification or destruction, and gas accumulation overpass multiple tectonic periods. So the trap type is complicated and dominated by combination traps. Because the main accumulation period of natural gas is early and the reservoir encountered the modification of strong Himalayan movement, there is great difference in the fullness degree of gas reservoirs and complicated gas-water relation. (4) Reservoir is tight to very tight, but reservoirs of relatively high quality developed under the super tight setting. (5) The key techniques for oil and gas exploration in west Sichuan foreland basin are the prediction of relatively favorable reservoirs, fractures and gas bearing; and the key techniques for oil and gas development are how to improve the penetration rate, reservoir protection and modification. 相似文献
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在探讨高邮凹陷断层发育时期和分布特点的基础上,结合油气分布特点,分析了断层在油气成藏中的作用类型,并探讨了其作用机理。依据断层在油气生成、运移、聚集和分布环节中的作用,把断层分为控源断层、供烃断层、改向断层、成圈断层和调整破坏断层。控源断层控制有效烃源岩展布和生烃时期的早晚,高邮凹陷控源断层下降盘为有效烃源岩分布区,而且西部地区早于东部地区生烃;供烃断层控制油气主运移通道的走势,其陡断面和凸断面为高邮凹陷断裂带油气的主运移通道;改向断层影响油气的富集层位和油气富集区的位置,其对高邮凹陷油气分布的影响存在“分散”和“富集”两种效应;成圈断层控制圈闭的类型及分布;调整破坏断层导致圈闭充满程度和原油物性的改变,高邮凹陷调整破坏断层为盐城期和三垛期活动断层。高邮凹陷断层的多期性和多样性导致断层体系中各断层封闭性在时空上的差异性和多变性,从而形成对油气控制的多面性和复杂性。 相似文献
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在探讨高邮凹陷断层发育时期和分布特点的基础上,结合油气分布特点,分析了断层在油气成藏中的作用类型,并探讨了其作用机理。依据断层在油气生成、运移、聚集和分布环节中的作用,把断层分为控源断层、供烃断层、改向断层、成圈断层和调整破坏断层。控源断层控制有效烃源岩展布和生烃时期的早晚,高邮凹陷控源断层下降盘为有效烃源岩分布区,而且西部地区早于东部地区生烃;供烃断层控制油气主运移通道的走势,其陡断面和凸断面为高邮凹陷断裂带油气的主运移通道;改向断层影响油气的富集层位和油气富集区的位置,其对高邮凹陷油气分布的影响存在"分散"和"富集"两种效应;成圈断层控制圈闭的类型及分布;调整破坏断层导致圈闭充满程度和原油物性的改变,高邮凹陷调整破坏断层为盐城期和三垛期活动断层。高邮凹陷断层的多期性和多样性导致断层体系中各断层封闭性在时空上的差异性和多变性,从而形成对油气控制的多面性和复杂性。 相似文献
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发育在压性、压扭性盆地中的同沉积逆断层上盘地层比下盘地层相应地要薄。上盘可缺失某些层段或一直未接受沉积,上盘发育的不对称背斜可为同生、部分同生或后生;下盘地层有时呈楔状向断层处加厚,凹陷内的断层两侧岩性差异小,盆缘或凹陷边界断层岩性差异明显。断面形态有铲形和平直形,前者主要与逆冲推覆有关,后者主要受基底断块控制。断层活动方式有连续和间歇性活动两种。断层发育阶段分为同生冲断期、褶皱发育期和消亡期。 同沉积逆断层具有良好的聚油条件。圈闭形式主要有上盘背斜、断层遮挡、浅层压实背科、基岩潜山及地层尖灭等,并可叠合连片。聚油方式以“新生古储”为主,并有“古生新储”;油气主要通过接触式或顺断层运移。 相似文献
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黎家盆 《物探化探计算技术》2003,25(3):193-196
在川西地区浅层油气勘探开发过程中,已总结出地震“低频、强振幅”油气预测模式,并早已应用于勘探中。随着该区勘探开发程度的提高,该模式作为已成熟的油气预测方法在一些地区出现了预测失误。这里经分析了地震“低频、强振幅”的形成机理后总结出了模式预测中典型的“陷井”,并提出了降低模式预测风险的附加条件。 相似文献