烃源岩热解分析参数tmax异常的原因.pdfVIP

　　　　　　 72 2006 2 　　　　 　　　　PET ROLEUM EXPLORATION AND DEVELOPMENT 　　　　　　　Vol. 33　No . 1　 :1000-0747(2006)0-1 007-2 04 Tmax 张振苓, 邬立言, 舒念祖 (中国石油勘探开发研究院) :中国石油天然气股份有限公司科技攻关项目“油气地质实验技术方法研究”(090010020) :归纳整理中国25 000 多块烃源岩热解 析资料, 发现有些岩石样品的 Tmax 值异常低, 有些 Tmax 值异常高, 有些 Tmax 在某 一深度突然升高后又降低, 与烃源岩所处的埋深和时代不相符。通过烃源岩、干酪根热解热模拟试验、干酪根显微组 成烃活化能 布测定、岩石热解 析称样量对 Tmax 影响试验等, 研究 Tmax 异常的原因, 认为可溶有机质(包括烃源岩中 存在的原油和沥青)以及钻井液有机添加剂的侵入都会引起S 1 峰增大, 还由于可溶重质组 进入S 2 峰而导致 Tmax 降低。 显微组 中存在树脂体的烃源岩 Tmax 普遍偏低;矿物对烃类的吸附导致低有机碳含量的烃源岩 Tmax 偏高, 受火成岩侵入 的烃源岩 Tmax 异常高, 岩石热解 析的称样量也对 Tmax 有影响。 图10 表 3 参7 :岩石热解;Tmax 常;烃源岩 :TE632　　　:A Cause analysis of abnormal Tmax values on Rock-Eval pyrolysis ZHA NG Zhen-ling, W U L-i yan, SHU Nian-z (R esearch I nstitute of P etroleum E xp loration D evelop m en t, P etroChina, B eij ing 100083, Ch ina ) Abstract:The abnormal Tmax val es have been observed on Rock-Eval pyrolysis in over 25 000 so rce rock samples in China. Some Tmaxval es are abnormally high, some abnormally low, and others decrease following an abr pt increase at certain depth. These phenomena are incompatible w ith the b ried depth and ages of the samples. So rce rock and kerogen sim lation experiments, and activation energy distrib tion meas rement of kerogen maceral have been carried o t to find the ca ses of the abnormal Tmax val es. The bit men, migrated oil and contamination f rom organic additive and oil of drilling m d enhance S 1 peaks of so rce rocks. Some sol ble heavier f raction overlaps S 2 peaks, res lting in lower Tm ax val es. The ab ndant resinite in maceral is also the ca se of lower Tmax val es. The mineral matrix conservation on hydrocarbons and the intr sion of igneo s rock in so rce rocks attrib te to higher Tmax val es as well. The sample w eight infl ence on Tmax val e has als