Diagenetic history of tight sandstones and gas entrapment in the Yulin Gas Field in the central area of the Ordos Basin,China   总被引：2，自引：0，他引：2  

Liuping Zhang  Guoping Bai  Xiaorong Luo  Xinhua Ma  Mengjin Chen  Minghui Wu  Wenxiu Yang 《Marine and Petroleum Geology》2009

The Ordos Basin is a large cratonic basin with an area of 250,000 km² in central China. Upper Paleozoic coals and shales serve as gas source rocks with peak generation and migration at the end of the early Cretaceous. Recent exploration has verified the huge gas potential in the “basin-centered gas accumulation system” (BCGAS). However, the mechanism for the gas accumulation is controversial. With an integrated approach of thin-section petrography, ultra-violet fluorescence microscopy, fluid inclusion microthermometry, Raman microspectrometry, scanning electron microscopy, and X-ray diffractometry, we identified diagenetic trapping and evaluated the diagenetic history of sandstone reservoirs in the Yulin Gas Field in the central area, where structural, stratigraphic and/or sedimentary lithologic traps have not been found. It was revealed that three phases of diagenesis and hydrocarbon charging occurred, respectively, in the late Triassic, late Jurassic and at the end of the early Cretaceous. In the first two phases, acidic water entered the reservoir and caused dissolution and cementation, resulting in porosity increase. However, further subsidence and diagenesis, including compaction and cementation, markedly reduced the pore space. At the end of the early Cretaceous, the bulk of the gas migrated into the tight reservoirs, and the BCGAS trap was formed. In the updip portion of this system, cementation continued to occur due to low gas saturation and has provided effective seals to retain gas for a longer period of time than water block in the BCGAS. The mechanism for the gas entrapment was changed from water block by capillary pressure in the BCGAS to diagenetic sealing. The diagenetic seals in the updip portion of the sand body were formed after gas charging, which indicates that there is a large hydrocarbon exploration potential at the basin-centered area.  相似文献   

能源环境与可持续发展   总被引：7，自引：0，他引：7  

李明辉  肖青 《地域研究与开发》1997,16(3):24-27,36

从可持续发展的内涵来看，环境是可持续发展的核心，而能源环境是我国环境面临的首要问题，其产生的根源在于以煤为主的能源消费结构，此外能源技术水平相对落后，产业结构，能源价格不尽合理其对亦有较大的影响本文在剖析能源环境成因的基础上，提出相应的对策，以祈为能源行业可持续发展提供一些参考。  相似文献   

9810号台风过程厦门近岸海域POC的变化特征   总被引：2，自引：1，他引：2  

薛健宏  杨逸萍  郭卫东  胡明辉 《台湾海峡》2000,19(3):269-275

本文研究了９８１０号台风影响下九龙江口及厦门西港表层海水颗粒有机碳（ＰＯＣ）的变化特征及其与某些环境因子的关系,除厦门西港低潮水外,台风期间ＰＯＣ含量的迅速增大,此“冲击期”共维持３ｄ后ＰＯＣ值迅速回落,进入“恢复期”。台风期间,九龙江口高低潮,厦门西港高潮表层水ＰＯＣ含量分别为０．７３９、１．３１９和０．８４８ｍｇ／ｄｍ＾３,是非台风状况下的１．１、１．９和１．４倍,陆源有机物的输入和底质再悬浮作用是控制表层水ＰＯＣ含量的主要因素,而厦门西港低潮水ＰＯＣ含量受台风作用影响较小,碎屑ＰＯＣ为厦门近岸海域表层海水ＰＯＣ的主要组成部分。ＰＯＣ与溶解态Ｎ、Ｐ营养盐有一定正相关性,暗示其可能来自颗粒物有机Ｎ、Ｐ的生物降解。  相似文献   

Phosphate limitation of phytoplankton growth in the Changjiang Estuary   总被引：2，自引：1，他引：2  

Hu Minghui  Yang Yiping  Xu Chunling  P. J. Harrison 《海洋学报(英文版)》1990,9(3):405-411

Laboratory experiments of bioassay with Pltaeodaetytum tricornutum, Chatoceros didymus, Chaetoreros calcitraus and Heterogtoea sp. sampled from the Changjiang Estuary in spring and summer, 1986, indicated that both N and P limit phytoplankton growth in the medium with N : P ranged between 8-30, and N limits phytoplankton production in the medium with N: P<8, while P is the limitary nutrient in the N : P>30. Generally, N : P in the Changjiang Estuary waters is 2 times higher than Redfield ratio. The bioassay experiments with high N : P water samples collected from Changjiang Estuary show that phytoplankton production is limited by P. Phytopiankton appears to give priority to the uptake of P at all periods of time. And the optimum N:P for phytoplankton growth is determined to be 18.  相似文献   

网络模式下的编辑流程   总被引：3，自引：0，他引：3  

姚明慧  苏泽云  许炳 《华南地震》2007,27(2):94-97

以《防灾减灾工程学报》为例,介绍了在网络模式下,编辑部如何利用电子技术在稿件的收、审、回修以及建立审稿专家、作者信息库等环节,实现编辑流程优质高效运作的经验。  相似文献   

OCEAN BOTTOM SEISMOMETER AND ONSHOREOFFSHORE SEISMIC EXPERIMENT IN NORTHEASTERN SOUTH CHINA SEA   总被引：7，自引：0，他引：7  

QIU Xuelin~ 《大地构造与成矿学(英文版)》2004,28(1):28-35

Three-component Ocean Bottom Seismometers, portable land stations and marine air gun seismic sources were used to carry out an onshore-offshore deep seismic profile in northeastern South China Sea. This profile, orientated in NNW-SSE, was as long as 500 km and perpendicular to the strike of regional tectonics. The offshore data were processed in Taiwan Ocean University using a number of available software and the onshore data were analyzed in South China Sea Institute of Oceanology by new-written programs and public software. Preliminary results show that the seismic data are in good quality and contain rich information of deep structure. Seismic phases, e.g. Pg, PmP and Pn, are identified in the offset range 5～220 km, which will provide an important dataset for the deep crustal structure and oil-gas basin evolution studies of this region.  相似文献   

张盆压岭型地洼盆地基底沉降的数值分析与幕式构造-沉积作用   总被引：1，自引：0，他引：1  

杨明慧  魏永佩 《大地构造与成矿学》1999,23(2):108-114

主要进行柴达木北缘德令哈张盆压岭型地洼盆地侏罗纪——第四纪基底沉降的定量数值分析,并校正局部沉积物的加载引起的负荷沉降。借助基底抬升诱导的侵蚀效应建立了相应的沉降模式。分析表明,德令哈地洼盆地的演化历史可以分为四个阶段：２０４（？）～１３０Ｍａ（ＳⅠ）、１３０～９５Ｍａ（ＳⅡ）、６７～３５Ｍａ（ＳⅢ）和３５Ｍａ（ＳⅣ）至今,其沉降史记录了多期次幕式构造运动和幕式沉积作用。  相似文献   

Mineralogy and geochemistry of the Holocene lacustrine sediments in Nam Co, Tibet   总被引：3，自引：0，他引：3  

Minghui Li  Shichang Kang  Liping Zhu  Qinglong You  Qianggong Zhang  Junbo Wang 《Quaternary International》2008,187(1):105

The carbonates, clays and major chemical compositions of lacustrine sediments in Nam Co (Lake) were examined by X-ray diffraction, scanning electron microscopy and chemical analysis. Carbonates include monohydrocalcite (MHC, first report from China and in a high-altitude lake), low-Mg calcite and traces of dolomite. MHC in Nam Co is developed in water (1.8 g/L) with high Mg/Ca molar ratios (10.03–15.03), high pH (8.04–9.72) and the presence of bacteria, algae, diatom and ostracoda. Illite and Mg-chlorite provide a strong evidence for physical weathering in the Holocene. Most Ca and Sr in sediments originate from carbonates as the molar ratios of Ca and CO₃²⁻ are all less than 1 and the curve of Sr is very similar to that of Ca. However, most of the Mg, Fe and Rb are from clays. The lake water shifted from a fresh water environment to an evaporative, alkaline environment by 2.06 cal. ka BP. There was a depositional event that the depositional rate changed from 0.134 to 1.639 mm/a at about 2 cal. ka BP.  相似文献   

伸展盆地拆离构造分析及石油地质意义     

郑大海  杨明慧  杨斌谊 《地球科学与环境学报》2000,22(4)

岩石圈的层状结构使拆离作用在沉积盆地中成为一种普遍发生的现象。拆离作用具有 4种岩石圈伸展模式。拆离构造具有发育剪切滑移带、多级次滑脱、构造形态上下不协调、发育动力变质岩和地层重复或缺失等特征。拆离作用形成的几种伴生构造可作为油气储集的地质体  相似文献   

相邻地形对地震动特性的影响分析     

郝明辉  张郁山 《中国地震》2015,31(4):656-667

基于采用透射人工边界的显式动力有限元方法,研究了相邻凸起地形对地震动反应谱特性的影响,分析了相邻凸起之间距离的变化对地形效应的影响。研究结果表明:1与单一凸起地形对地震动的放大效应相比,相邻地形的存在对地震动反应谱谱比曲线的形状影响不大,但对谱比的值具有较大影响,而且其影响程度的大小与地表观测点的位置有关;2相邻凸起地形的存在对凸起平台段中点地震动高频成分的放大效应影响较大,随着相邻凸起之间距离的增加,该影响逐渐减弱,多个相邻凸起构成的组合地形对地震动的放大效应逐渐接近单一凸起地形。  相似文献