CAJ | 학술논문

研究了鄂尔多斯晚三叠世湖盆古气候变迁及古水体特征.研究结果表明:鄂尔多斯晚三叠世湖盆古纬度为北纬31.03°,比现在所处的纬度35.10°偏南4°多,推测晚三叠世时鄂尔多斯湖盆气候温暖潮湿,生物繁盛,能够形成有机质丰富的烃源岩.利用泥岩B,Sr,Ba元素测试结果及Sr,Ba质量分数比值法,以及岩石碳酸盐岩胶结物稳定同位素分析表明,鄂尔多斯晚三叠世长8期-长6期湖盆是一个淡水湖盆,长8期-长7期-长6期湖盆水体范围与深度经历了收缩-扩大-收缩的过程,纵向上构成了储层-烃源岩-储层的生储盖组合,从湖盆演化的特征上论证了鄂尔多斯盆地晚三叠世油气勘探的实际意义.
연구료악이다사만삼첩세호분고기후변천급고수체특정.연구결과표명:악이다사만삼첩세호분고위도위북위31.03°,비현재소처적위도35.10°편남4°다,추측만삼첩세시악이다사호분기후온난조습,생물번성,능구형성유궤질봉부적경원암.이용니암B,Sr,Ba원소측시결과급Sr,Ba질량분수비치법,이급암석탄산염암효결물은정동위소분석표명,악이다사만삼첩세장8기-장6기호분시일개담수호분,장8기-장7기-장6기호분수체범위여심도경력료수축-확대-수축적과정,종향상구성료저층-경원암-저층적생저개조합,종호분연화적특정상론증료악이다사분지만삼첩세유기감탐적실제의의.
This study presents the palaeolatitudinal change and the character of connate water in Late Triassic of Ordos Basin. The results show that palaeolatitude of Ordos ancient lake-basin in Late Triassic was 4° more than the present latitude which is 35.1°. So the climate of Late Triassic was presumed to be mild and humid, creature got flouring, and organic substances were rich, which could generate oil source rock of abundant organic substance. Utilizing outcome of test about B, Sr, Ba element in mudstone, and contrast it with element geochemistry index, Ordos Basin from Ch8 to Ch6period was freshwater lake basin. The wate area and deepness of lake-basin had experienced course of shrinkage-spread-shrinkage during Ch8 , Ch7 and Ch6, which constituted reservoir-oil source rock-cap rock in longitudinal. The study verifies the significance for oil gas prospecting in Ordos Basin in the period of late Triassic.