它日错地区下白垩统烃源岩有机地球化学特征
发布时间：2018-07-25 10:18
【摘要】：它日错地区是措勤盆地海相沉积储层中重要的发育区域,区域内下白垩统地层被认为是措勤盆地重要烃源岩。本文以沉积地质学和有机地球化学理论为基础,针对它日错地区下白垩统(包括郎山组和多尼组)进行了野外地质调查、剖面实测、室内烃源岩分析,详细研究了下白垩统两套烃源岩(郎山组和多尼组)的沉积特征和有机地球化学特征,主要取得了以下认识:充分利用野外剖面实测资料,对研究区沉积特征和岩相进行了厘定:它日错地区下白垩统主要的沉积类型郎山组为一套浅海碳酸盐岩台地相沉积,含有丰富的生物碎屑;多尼组为一套正常的碎屑岩为主,主要发育三角洲相。结合研究区烃源岩样品的有机地球化学分析数据,主要通过下白垩统烃源岩的有机碳(TOC)、氯仿沥青 A‖、镜质体反射率(Ro)、热解峰温(Tmax)、干酪根显微组分鉴定、碳同位素检测、有机元素检测的组成等研究内容进行了数据处理和分析,结果显示郎山组碳酸盐岩约90%的样品已达到了烃源岩水平,多尼组整体显示为较差的烃源岩和未达到烃源岩标准。下白垩统烃源层整体的有机质类型为Ⅱ2-Ⅲ型:郎山组有机质类型以Ⅱ2型为主,多尼组为Ⅱ2-Ⅲ型。热演化程度整体处于成熟-高成熟阶段,并以成熟阶段为主,其中郎山组的成熟度显示高于多尼组。因此,郎山组生烃潜力较好于多尼组。综合分析了下白垩统烃源岩的生物标志化合物,郎山组样生烃母质以低等水生生物为主,为水体较深的咸水还原环境;多尼组烃源岩生烃母质以低等水生生物为主,也有部分高等植物的贡献,形成于水体较深,盐度不高的半咸水环境。两组均已达到了成熟界限,相对来看,郎山组烃源岩样品的成熟度比多尼组烃源岩高。
[Abstract]:The Tarijiao area is an important developing area in the marine sedimentary reservoirs of the Cuoqin Basin, and the Lower Cretaceous strata in the region are considered as the important source rocks of the Cretaceous Basin. Based on the theory of sedimentary geology and organic geochemistry, the field geological survey, profile measurement and indoor source rock analysis of the Lower Cretaceous (including Langshan formation and Doni formation) have been carried out in this paper. The sedimentary and organic geochemical characteristics of two sets of lower Cretaceous source rocks (Langshan formation and Doni formation) are studied in detail. The sedimentary characteristics and lithofacies of the study area are determined as follows: the main sedimentary type of Lower Cretaceous is Langshan formation, which is a set of shallow sea carbonate platform facies, and is rich in bioclastic rocks, while the Doni formation is dominated by a set of normal clastic rocks. The delta facies are mainly developed. Combined with the organic geochemical analysis data of source rock samples in the study area, the organic carbon (TOC), chloroform bitumen of Lower Cretaceous source rocks, vitrinite reflectance (Ro), pyrolysis peak temperature (Tmax), kerogen macerals, and carbon isotope detection were used. Data processing and analysis of the composition of organic elements have been carried out. The results show that about 90% of the carbonate rock samples in Langshan formation have reached the source rock level, while the Doni formation as a whole shows poor source rock and does not meet the source rock standard. The type of organic matter in the lower Cretaceous source bed is type 鈪，
本文编号：2143510
[Abstract]:The Tarijiao area is an important developing area in the marine sedimentary reservoirs of the Cuoqin Basin, and the Lower Cretaceous strata in the region are considered as the important source rocks of the Cretaceous Basin. Based on the theory of sedimentary geology and organic geochemistry, the field geological survey, profile measurement and indoor source rock analysis of the Lower Cretaceous (including Langshan formation and Doni formation) have been carried out in this paper. The sedimentary and organic geochemical characteristics of two sets of lower Cretaceous source rocks (Langshan formation and Doni formation) are studied in detail. The sedimentary characteristics and lithofacies of the study area are determined as follows: the main sedimentary type of Lower Cretaceous is Langshan formation, which is a set of shallow sea carbonate platform facies, and is rich in bioclastic rocks, while the Doni formation is dominated by a set of normal clastic rocks. The delta facies are mainly developed. Combined with the organic geochemical analysis data of source rock samples in the study area, the organic carbon (TOC), chloroform bitumen of Lower Cretaceous source rocks, vitrinite reflectance (Ro), pyrolysis peak temperature (Tmax), kerogen macerals, and carbon isotope detection were used. Data processing and analysis of the composition of organic elements have been carried out. The results show that about 90% of the carbonate rock samples in Langshan formation have reached the source rock level, while the Doni formation as a whole shows poor source rock and does not meet the source rock standard. The type of organic matter in the lower Cretaceous source bed is type 鈪，
本文编号：2143510
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