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用自然伽马测井数据估算桑托斯盆地的地层生热率
孙旭东1, 郭兴伟1, 郑求根2, 温珍河1, 张训华1, 王锦洲2, 李子渊3
1.青岛海洋地质研究所;2.中国地质大学(北京);3.中国石油西南油气田分公司 (成都)
摘要:
岩石生热率是研究地球内热的一个重要的参数。本文根据自然伽马与岩石生热率的关系,利用盆地4口钻井的自然伽马测井曲线,计算出桑托斯盆地主要岩石或矿物及地层的生热率。本文统计了2964个自然伽马测井数据值,主要岩石或矿物的生热率从大到小依次为:泥岩、砂岩、页岩、玄武岩、石灰岩、硬石膏和盐岩;盆地地层的生热率随深度增加显著降低,生热率体现出受控于岩性变化的特征。以S1井为例,根据岩石生热率和热流的关系,计算出盆地中各个组的生热率,Marambaia组、Itajai-Acu组、Itanhaem组、Ariri组、Guaratiba群、Camboriu组生热率分别是1.36±0.16μW/m3、1.52±0.15μW/m3、1.30±0.3μW/m3、0.46±0.18μW/m3、0.64±0.23μW/m3、0.37±0.07μW/m3,盆地沉积地层产生的热量占表层大地热流的13.62%,因此沉积地层具有一定的产热潜力,对区域有机质的成熟度有一定的影响。建立了岩石圈分层生热模型,其中地壳热流贡献为15.38mW/m2,占表层大地热流的30.76%,地幔热流贡献值为34.62mW/m2,地壳和地幔的热流比例为0.44,具有“冷壳热幔”的特征。
关键词:  桑托斯盆地  生热率  自然伽马测井  热结构
DOI:10.11759/hykx20200408001
分类号:
基金项目:国家重大科技专项(2016ZX05033-001-001)、国家自然科学基金项目(41776081、91958210)、中国地质调查局项目(DD20190429、DD20190365、DD 20190377)
Estimation of heat generation in Santos basinwith natural gamma logging data
sunxudong1, guoxingwei1, zhengqiugen2, wenzhenhe1, zhangxunhua1, wangjinzhou2, liziyuan3
1.Qingdao Institute of Marine Geology;2.China University of Geosciences(Beijing);3.Petrochina Southwest Oil & Gas field Company(Chengdu )
Abstract:
The rock heat generation is an important parameter for the study of the heat in the earth. According to the relationship between natural gamma and heat generation of rocks, the heat generation of main lithology or minerals and strata in Santos basin is calculated by using the natural gamma logging curves of 4 wells in the basin. In this paper, 2964 natural gamma logging data values are collected. The heat generation of main lithology or minerals are clay, mudstone, sandstone, shale, basalt, limestone, anhydrite and salt rock in order; with the increase of the depth, the heat generation of the strata in the basin decreases significantly, which is controlled by the change of lithology. Taking well S1 as an example, according to the relationship between heat generation and heat flow of rocks, the heat generated by sedimentary strata in the basin is calculated. The heat generation of Marambaia Formation、Itajai-Acu Formation、Itanhaem Formation、Ariri Formation、Guaratiba Group、Camboriu Formation are 1.36±0.16μW/m3、1.52±0.15μW/m3、1.30±0.3μW/m3、0.46±0.18μW/m3、0.64±0.23μW/m3、0.37±0.07μW/m3, respectively, accounting for 13.62% of the surficial heat flow. Therefore, the sedimentary strata in the study area have certain heat generation potential, which has a certain impact on the maturity of regional organic matter. A layered model of lithospheric heat generation rate is established, in which the contribution of crust heat flow is 15.38 mW/m2, accounting for 30.76% of the surface earth heat flow, the contribution of mantle heat flow is 34.62 mW/m2, and the ratio of crust and mantle heat flow is 0.44, which is characterized by "cold crust and hot mantle".
Key words:  Santos basin  heat generation rate  natural gamma logging  thermal structure
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