普光地区侏罗系烃源岩地球化学特征及资源潜力评价

发布时间：2018-05-15 00:02

  本文选题：地球化学特征 + 烃源岩评价　； 参考：《成都理工大学》2015年硕士论文

【摘要】：普光地区位于四川盆地东北部,勘探面积约为1116km2。构造上北抵大巴山逆冲推覆构造带前缘褶断带,南至川中平缓褶皱带。普光地区中—下侏罗统主要发育千佛崖组(J2q)和自流井组(J1z)两套烃源岩层。目前普光地区对中—下侏罗统烃源岩分布特征、烃源岩演化及生排烃特征、生烃演化史及资源潜力的认识还不深入,尤其是烃源岩的主要生排烃期、规模及大小等。本文在对研究区的沉积、构造背景系统研究基础上,应用地震及钻井资料,结合上三叠统沉积以来经历的构造阶段,分析了不同阶段的构造活动特点以及对烃源岩层的改造和油气成藏的影响,并进行了沉积间断面剥蚀厚度的恢复。利用岩石有机碳丰度、类型、成熟度分析,热解分析和干酪根镜检等地化方法研究了普光地区中—下侏罗统烃源岩基本地化特征。研究结果:千佛崖组烃源岩有机碳含量0.4%~2.89%,平均为0.88%,中等—好烃源岩占50%;氯仿沥青“A”含量0.0015%~0.0479%,平均为0.0018%,总烃含量平均10.74ppm。自流井组烃源岩有机碳含量0.4%~2.508%,平均为1.02%,中等—好烃源岩占80%;氯仿沥青“A”含量0.00115%~0.0274%,平均为0.0066%,总烃含量平均为7.21ppm。两套烃源岩层主要发育Ⅲ型有机质,少量发育Ⅱ型。Ro%的平均值在1.9%左右,已达到高成熟~过成熟阶段。从剥蚀厚度恢复结果来看,燕山—喜山期剥蚀厚度大,在2295m~3654m之间,平面上主要呈现为隆起构造带剥蚀量大,洼陷剥蚀量小的特点。通过实验数据以及参阅文献资料,明确了盆地模拟所需的各项参数,利用盆模软件PetroMod对普光地区中—下侏罗统烃源岩进行了生排烃量和生排烃时期的模拟计算。模拟结果:自流井组烃源岩于中侏罗世中期进入生烃门限,早白垩世末期Ro达到1.3%(高成熟阶段);千佛崖组烃源岩于晚侏罗世晚期进入生烃门限,早白垩世末期Ro达到1.3%(高成熟阶段)。侏罗系烃源岩天然气总资源量为653.33×108m3。其中,自流井组资源量为287.04×108m3,千佛崖组资源量为366.29×108m3。研究结果表明:两套烃源岩有机碳含量分布不均,属于中—好的烃源岩,但局部发育较好的烃源岩层;源岩母质类型以Ⅲ型干酪根为主;热演化程度均达到成熟—高成熟阶段,均已大量生气;综合研究区两套烃源岩地球化学特征、热演化模拟及资源量计算结果,该区资源潜力较大,具备较高的开发潜力。
[Abstract]:The Puguang area is located in the northeast of Sichuan Basin, and the exploration area is about 1116km2. The north reaches the front fold fault zone of the Dabashan thrust nappe belt, and the south reaches the central Sichuan gentle fold belt. Two sets of hydrocarbon source rocks, Qianfoya formation and Ziliujing formation, are mainly developed in the Middle and Lower Jurassic in Puguang area. At present, the characteristics of source rock distribution, source rock evolution, hydrocarbon generation and expulsion, hydrocarbon generation history and resource potential in Puguang area are not well understood, especially the main hydrocarbon generation and expulsion periods, scale and size of hydrocarbon source rocks. On the basis of the study of sedimentary and tectonic background systems in the study area, this paper applies seismic and drilling data to the structural stages experienced since the Upper Triassic Sedimentary. The characteristics of tectonic activity in different stages and its influence on the transformation of source rock formation and hydrocarbon accumulation are analyzed, and the denudation thickness of intersedimentary cross-section is restored. The localization characteristics of the source rocks of the Middle-Lower Jurassic in Puguang area were studied by means of organic carbon abundance, type, maturity analysis, pyrolysis analysis and kerogen microscopic examination. The results show that the organic carbon content of Qianfoya formation source rock is 0.4 ~ 2.89, with an average of 0.88 and 50 with moderate to good hydrocarbon source rock, while the chloroform asphalt "A" content is 0.0015 and 0.0479, with an average of 0.001818 and a total hydrocarbon content of 10.74 ppm. The organic carbon content in the source rocks of the Ziliujing formation is 0.40.508, with an average value of 1.02and the medium-good source rocks account for 80. The chloroform bitumen "A" content is 0.00115and 0.0274, with an average value of 0.0066g, and the total hydrocarbon content is 7.21ppm. The two sets of source rocks mainly developed type 鈪，

本文编号：1890050