辉绿岩床侵入对围岩有机质热演化影响的模拟研究——以赵家山下马岭组剖面为例

doi:10.13809/j.cnki.cn32-1825/te.2022.01.022

摘要/Abstract

摘要：

燕山地区中上元古界下马岭组发育大套黑色页岩,是页岩气勘探的潜在目标层位。野外剖面调查显示下马岭组地层中有多套辉绿岩床侵入,是制约油气成藏的关键因素。选取赵家山下马岭组剖面为研究对象,在实测剖面以及开展成熟度测定的基础上,重点对侵入黑色页岩段的一套约7 m厚的辉绿岩床对围岩成熟度的影响开展数值模拟研究。结果表明,这套辉绿岩床对围岩R_o（镜质体反射率）的影响范围约为8.5 m,是自身厚度的1.2倍,并且靠近岩床方向R_o呈指数增加。数值模拟结果显示,这套辉绿岩在110年后基本冷却,对围岩地温场的扰动范围约为100 m,远大于对R_o的影响范围,只有当围岩温度能达到并超过250 ℃时才会引起R_o值的变化响应。辉绿岩床厚度越大,对围岩R_o的影响范围越大,靠近岩床方向R_o增加的程度越大;辉绿岩床对围岩有机质R_o的影响范围为自身厚度的1倍以上。

关键词: 下马岭组, 露头剖面, 辉绿岩床, 黑色页岩, 有机质成熟度

Abstract:

The black shales is widely distributed in Proterozoic Xiamaling Formation of Yanshan area, making the Xiamaling Formation to be an important potential target for shale gas exploration. Field profile survey shows that several sets of diabase sill intruded into Xiamaling Formation, which has great influence on oil and gas accumulation. Therefore, the numerical simulation study on the influence of a set of diabase bed about 7 m thick on the maturity of host rock is carried out based on the measurement of the field section and bitumen reflectance of the neighbouring shales. The results show that the influence range of this diabase bed on R_o of organic matter in host rock is about 8.5 m, which is about 1.2 times of its own thickness. The measured R_o values increases exponentially near the bedrock. The numerical simulation results show that the diabase will cool down almost completely after 110 years, and the disturbance range to the surrounding rock geothermal field is about 100 m, which is much larger than the influence range of R_o. Only when the surrounding rock temperature is greater than or equal to 250 ℃ can it cause the change response of the R_o values. The greater the thickness of diabase bed, the greater the influence range on R_o of organic matter in host rock, and the greater the increase of R_o near the bedrock. The influence range of diabase bed on R_o of organic matter in host rock is about the same to its own thickness.

Key words: Xiamaling Formation, outcrop section, diabase sill, black shale, thermal maturity of organic matter

中图分类号:

TE121

刘君兰,张金川,王胜等. 辉绿岩床侵入对围岩有机质热演化影响的模拟研究——以赵家山下马岭组剖面为例[J]. 油气藏评价与开发, 2022, 12(1): 255-264.

Junlan LIU,Jinchuan ZHANG,Sheng WANG, et al. Numerical simulation of influence of diabase bed intrusion on thermal evolution of organic rich host rock: A case study of Zhaojiashan Xiamaling Formation[J]. Reservoir Evaluation and Development, 2022, 12(1): 255-264.

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参数赋值	辉绿岩参数			围岩参数
参数赋值	密度（kg/m³）	比热容（J/kg•K）	热导率[W/（m·K）]	密度（kg/m³）	比热容（J/kg•K）	热导率[W/（m·K）]
本文参数赋值	2 600	850	2.10	2 400	820	1.60
文献参数取值	2 600^{[19, 22]} 2 720^[20] 2 700^[23]	787^[24] 820^{[19, 22]} 1 090^[20] 1 200^[23]	2.10^{[19, 22, 23]} 2.50^[20] 2.64^[25]	2 600^[19] 2 700^{[20, 23]} 2 400^[22]	820^{[19, 23]} 850^[22] 1 090^[20]	1.30^[23] 1.72^[24] 2.10^{[20, 22, 25]}