UNUSUAL DISTRIBUTION OF TRITERPANE AND STERANE TERRESTRIAL BIOMARKERS IN YACHENG CONDENSATES FROM YING-QIONG BASINS, SOUTH CHINA SEA   总被引：1，自引：0，他引：1  

周毅  盛国英  傅家膜  耿安松  陈军红  张启明  潘贤庄  黄保家 《中国海洋湖沼学报》2002,20(2):182-190

The condensates from the Yacheng Gas Field, Ying-Qiong Basins, have unusual chemical characteristics, with distribution dominated by terpanes and steranes derived from higher-plants. Pr/Ph ratios (6- 11 ) are very high. Drimane, cadinanes and homocadinanes exist in high concentration. Anomalously abundant 18α(H)-oleanane and remarkably abundant bicadinanes are present in Yacheng condensates, while 17α( H)-hopanes are in extremely low concentration. Taraxastane and significantlyabundant 17α(H)-diabopanes occur in the condensates. In addition, a number of C29 and C30 unknown pentacyclic triterpanes were monitored in the condensates, some of which are abundant. The unknown compounds may be terrestrial biomarkers or their occurrence may suggest a sub-oxic (dyacrobic) clay-rich depositional environment. C29 homologues are relatively predominant in regular and rearranged steranes. The concentration of diasteranes is markedly higher than that of regular steranes. The characteristics of Yacheng condensates are indicative of terrestrial source input. Based on condensate-condensate and con-densate-rock correlations, combined with results of studies on sedimentary facies. Yacheng condensates may be sourced from Yacheng and Lingshui Formations in the Qiongdongnan Basin. The maturity of Yacheng condensate is relatively high, at late oil window stage ( corresponding to 0.9 % - 1.3 % R0 ),based on sterane and terpane maturity parameters.  相似文献   

鄂西宁乡式铁矿的形成和分布规律(对鄂西地区今后地質找矿及勘探工作提供几点意见)          下载免费PDF全文

傅家謨 《地质科学》1959,2(4):109-115

冶金工業部和地質部的勘探队经过几年來的地質工作,已经証实鄂西宁乡式铁矿系我国目前巨大的铁矿之一。該矿产于上泥盆纪地层中,分布在鄂西長阳、建始、恩施……等县,幅員广大,铁矿品位好,储量大。放在地質勘探者面前的重要任务,就是如何进一步继續扩大鄂西地区的铁矿储量,为国家在鄂西建立巨大鉄矿基地提供地質資源。为了完成这一任务,笔者通过一年多的工作感到有兩个問題需要提出。  相似文献   

鄂西宁乡式鉄矿的相与成因     

傅家謨 《地质学报》1961,40(2)

自1957年至1961年,我们重点研究了鄂西两个地区的铁矿相,并对各铁矿相的矿石进行了薄片研究、化学分析、物相分析、差热分析、X-光鑑定和机械分析。在研究过程中,发现有一些重要事实不能为现有的经典成矿理论所解释;且近代水化学、海洋学和湖沼学所提供的许多重要材料也要求重新考虑铁矿的成因。由于沉积铁矿的成因是一个极其复杂的问题,所提的看法仅是初步认識,希望同志们批评指正。  相似文献   

砂岩成因分类芻议          下载免费PDF全文

傅家謨  陈先沛  王慶隆  武明友 《地质科学》1964,5(4):385-396

目前国內外普遍采用的砂岩分类乃是按物貭成分的分类。这些分类由于主要只考虑了砂岩的碎屑矿物成分,因而对其成因条件的反映有一定局限性。此种缺点在研究陆相沉积和构造活动較剧烈地区的沉积时表現得尤其突出。近年来,国外的一些学者已认識到这种缺点,开始探討更为合理的砂岩成因分类,但因所提方案存在有缺点,仍未受到人們的重視。作者在工作中深感已有分类的上述缺点,根据工作中的实际材料并参考已有分类的优点,試提了一个砂岩分类草案。  相似文献