中国南方高演化海相层系的古温标

doi:10.11743/ogg20090511

摘要/Abstract

摘要：

通过对四川盆地东北部普光5井等188块钻井样品镜质体反射率(VR_o)等多项热演化分析数据,并结合沉积演化史的综合研究,认为:①VR_o或固体沥青反射率等效BR_o及伊利石结晶度等恢复的古地温可以作为良好的古温标,它反映的是该地层在有效受热时间内所经历的最高地层温度,古地温增高,VR_o或等效BR_o呈指数增加,有效受热时间越长,VR_o或等效BR_o也相对增大;②流体包裹体均一温度是研究地层所经历古温度和成藏期次最直接的古温标,其最高流体包裹体捕获或均一温度与VR_o等恢复的古地温相当,基本上代表了最高古地温,它还是成藏期次和不同时期热史恢复的有效指标;③磷灰石和锆石等(U-Th)/He的封闭温度也可以作为古温标,它与定年相配合可进行成盆和隆升造山的热史恢复;④高演化海相层系可根据VR_o或等效BR_o、最高包裹体均一温度、伊利石结晶度、磷灰石及锆石等(U-Th)/He封闭温度年龄等技术恢复最大古埋深、古地温及热史研究。

关键词: 镜质体反射率, 包裹体均一温度, (U-Th)/He封闭温度, 伊利石结晶度, 高演化海相层系, 中国南方

Abstract:

An integrated study is carried out by analyzing sedimentary and evolution history of the Sichuan Basin and various thermal evolution analytical data(such as vitrinite reflectance) of 188 core samples from Puguang-5 and other wells in northeastern Sichuan Basin.The results show that:1) palaeogeothermal restored by using vitrinite reflectance(VR_o) or equivalent bitumen reflectance(BR_o) and illite crystallinity can be used as good palaeo-geothermometers.It represents the maximum temperature that the strata underwent during effective heating time.The VR_o or equivalent BR_o shows exponential increase with paleotemperature increasing.Moreover,they also relatively increase along with the increasing effective heating time;2) homogenization temperature of fluid inclusion is the most direct palaeo-geothermometer for determination of paleotemperature and timing of hydrocarbon accumulation.The highest homogenization temperature of fluid inclusion is consistent with the paleotemperature recovered from vitrinite reflectance.It represents the highest palaeotemperature,and is also an effective index for timing of hydrocarbon accumulation and reconstruction of thermal histories of various stages;3) the closure temperature of apatite and zircon(U-Th)/He can also be used as geothermometer.Combined with dating,it can be applied to restore the thermal history of basin forming and orogenesis;4) therefore,for high mature marine sequences,the maximum paleo-burial depth,palaeogeothermal and thermal history can be restored according to VR_o or equivalent Bro,highest homogenization temperature of fluid inclusion,illite crystallinity and closure temperature of apatite and zircon(U-Th)/He combined with dating.

Key words: vitrinite reflectance, homogenization temperature of fluid inclusions, closure temperature of apatite and zircon(U-Th)/He, illite crystallinity, high mature sequence, South China

中图分类号:

TE121.1

秦建中,李志明,腾格尔. 中国南方高演化海相层系的古温标[J]. 石油与天然气地质, 2009, 30(5): 608-618. doi: 10.11743/ogg20090511 Qin Jianzhong,Li Zhiming,Teng Ge'er. A study on palaeo-geothermometer of high mature marine sequences in South China[J]. Oil & Gas Geology, 2009, 30(5): 608-618. doi: 10.11743/ogg20090511

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