二元同位素测温技术及其在白云岩储层成因研究中的应用——以塔里木盆地中下寒武统为例

发布时间：2018-08-02 15:13

【摘要】：作为近年来新兴的实验技术,二元同位素(D47)测温技术已被应用于碳酸盐岩成岩环境的研究中。简要介绍了二元同位素测温技术的原理及应用方法,并以塔里木盆地中下寒武统白云岩为例,优选11块样品,测试其D47值和白云石的碳氧同位素,并计算出样品的成岩温度和古流体的δ~(18)O值。综合分析认为:样品中,颗粒白云岩形成于低温准同生—浅埋藏环境,成岩流体为海水;细晶白云岩为深埋藏成岩环境中原岩受到了高温重结晶作用的改造,成岩流体为地下热卤水;孔缝中的白云石胶结物是深埋藏成岩环境富镁热卤水沉淀作用的产物。研究证明二元同位素测温技术可以较好地恢复白云岩的成岩温度,减少储层成因的多解性,它为今后储层成因研究提供了一种新的手段和依据。
[Abstract]:As a newly developed experimental technique, binary isotope (D47) temperature measurement has been applied to the study of carbonate diagenetic environment. The principle and application of binary isotopic temperature measurement technique are briefly introduced. Taking dolomite of middle and lower Cambrian in Tarim Basin as an example, 11 samples are selected and their D47 values and carbon and oxygen isotopes of dolomite are tested. The diagenetic temperature of the sample and 未 ~ (18) O value of paleofluid are calculated. The comprehensive analysis shows that the granular dolomite is formed in the low temperature quasi-syntectic shallow burial environment, the diagenetic fluid is seawater, the fine-grained dolomite is the deep-buried diagenetic environment, and the primary rock has been transformed by high temperature recrystallization. The diagenetic fluid is the underground hot brine and the dolomite cementation in the pore fracture is the result of the precipitation of the magnesium rich hot brine in the deep buried diagenetic environment. It is proved that binary isotopic temperature measurement technique can recover diagenetic temperature of dolomite and reduce the multi-resolution of reservoir genesis. It provides a new means and basis for reservoir genesis research in the future.
【作者单位】：中国石油杭州地质研究院;中国石油天然气集团公司碳酸盐岩储层重点实验室;中国石油大学(北京)地球科学学院;
【基金】：国家重大科技专项“大型油气田及煤层气开发”(2016ZX05004002) 中国石油天然气股份有限公司重大科技专项“深层油气勘探开发关键技术研究”(2014E-32)联合资助
【分类号】：P618.13;P629

【相似文献】