On time-space matching of hydrocarbon accumulation in the Yuquan Structure, Xihu Sag
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摘要:
以地质录井资料为基础，结合流体包裹体、自生伊利石同位素等地球化学资料，运用平衡剖面、盆地模拟技术，研究玉泉构造断裂演化史、圈闭发育史、埋藏史、成岩史、生烃史、油气成藏史及其时空匹配关系。研究表明：玉泉构造经历了前挤压反转期、挤压反转早期和挤压反转晚期3个阶段，其中挤压反转早期和晚期为NWW向调节断层和圈闭发育、定型的关键阶段；花港组下段H6—H7自13.0 Ma以来油气持续充注成藏至今，储层物性较差，花港组上段为13.0～11.4 Ma和4.2 Ma至今两期油气充注成藏，且第二期为主要油气成藏期，储层物性较好，龙井组为3.4 Ma至今一期充注成藏，储层物性好。总结出玉泉构造寻找有利勘探目标的关键条件为：以花港组上段为勘探主要目的层，靠近早期发育的NNE油源断层，避开晚期NWW向调节断层，指出玉泉3井区北部、玉泉1井区北部花港组上段以及玉泉3井区NWW向断层上盘龙井组、玉泉1井区龙井组上段为有利勘探区。
Abstract:Based on well logging and geochemical data including fluid inclusions and authigenic illite isotopes, geological evolution in faults, trapping, burial, diagenesis, hydrocarbon generation, oil and gas accumulation, and their spatio-temporal matching in the Yuquan Structure, Xihu Sag was studied using balanced profiling and basin modeling technology. Result shows that the Yuquan Structure experienced three stages in geological evolution: pre-compression inversion stage, early compression inversion stage, and late compression inversion stage, of which the early and late compression inversion stages are the key stages for the development and finalization of NWW regulating faults and traps. The lower member (H6-H7) of the Huagang Formation has been continuously filled with oil and gas since 13.0 Ma, and the reservoir physical properties are poor. The upper member of the Huagang Formation has been filled with oil and gas in 13.0 Ma to 11.4 Ma, and 4.2 Ma to the present. The second stage is the main oil and gas accumulation period, and the reservoir physical properties are good. The Longjing Formation has been filled with oil and gas from 3.4Ma to the current stage, and the reservoir physical properties are the best. The key points of finding favorable exploration targets for the Yuquan Structure include that the upper part of the Huagang Formation shall be taken as the main exploration target layer near the early-developed NNE oil-source fault, and the late NWW regulating fault shall be avoided. It is pointed out that the upper part of the Huagang Formation in the northern part of YQ-3 well block and the northern part of YQ-1 well block, the Longjing Formation in the hanging wall of NWW fault in YQ-3 well block, and the upper part of the Longjing Formation in YQ-1 well block are favorable exploration areas.
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