查干凹陷中央构造带不同断阶带原油成熟度特征差异及其成因分析

发布时间：2018-07-07 20:32

本文选题：查干凹陷 + 原油成熟度　；参考：《吉林大学学报(地球科学版)》2017年04期

【摘要】：查干凹陷中央构造带被巴润断裂系分隔成多个断阶,东侧第一断阶和第二断阶含油范围小而西侧第三断阶和第四断阶含油范围大。东部断阶原油成熟度高而西侧断阶原油成熟度低,表现为:第一断阶和第二断阶CPI大多数大于1.20,OEP多数大于1.30,Pr/Ph多数在0.60以下,Ph/nC_(18)普遍高于1.00;第三断阶和第四断阶CPI和OEP小于1.20,Pr/Ph多数在0.60以上,Ph/nC_(18)普遍小于1.00。通过规则甾烷分布特征和原油成熟度特征的分析,确定靠近洼陷的第三和第四断阶的原油更多来自于洼陷中心的烃源岩供烃,而第一断阶和第二断阶则主要是构造带本地烃源岩供烃。钻井、测井资料表明,断层发育诱导裂缝带和滑动破碎带,其中滑动破碎带物性较差,具有良好的封堵性能。非线性随机反演结果表明,巴润3号断层南段致密滑动破碎带稳定发育。断层生长指数研究表明,断层主要在苏二晚期活动,并且巴润3号断层活动性较弱。研究区断层SGR普遍在25%以上,在断层静止期具有良好的封闭性。烃源岩生排烃史模拟和流体包裹体均一温度分析表明,中央构造带主要成藏时间为苏二末期—银根早期,成藏期巴润3号断层由于活动强度较弱,同时沿着断层致密滑动破碎带发育,导致洼陷中形成的原油不易穿过3号断层继续向构造带东侧运移;因此第一断阶和第二断阶主要依赖本地烃源岩供烃,而第三第四断阶为洼陷中心供烃,烃源岩的差异最终导致了不同断阶带原油成熟度的差异。
[Abstract]:The central structural belt of Chagan depression is divided into several fault terraces by the Balun fault system. The oil range of the first and second fault stages in the east side is small and the oil range of the third and fourth faults in the west side is large. The maturity of the eastern fault stage crude oil is high, while the west fault stage crude oil maturity is low, The main results are as follows: the CPI of the first and the second order CPI is more than 1.20g / OEP and the majority of the CPI is more than 1.30g / pr / Ph, the majority of the CPI / nC18 is higher than 1.000.The CPI and OEP of the third and fourth stages are generally higher than 1.000.The CPI and OEP of the third and fourth stages are more than 0.60 and generally less than 1.00. Based on the analysis of regular sterane distribution and oil maturity, it is concluded that the third and fourth fault terraces near the sag come from the source rocks in the center of the sag. The first and second fault terraces are mainly supplied by local hydrocarbon source rocks in the tectonic belt. The drilling and logging data show that the fault developed induced fracture zone and sliding fracture zone, among which the sliding fracture zone has poor physical properties and good plugging performance. The results of nonlinear stochastic inversion show that the dense slip fracture zone in the southern segment of the fault No. 3 develops steadily. The study of fault growth index shows that the fault is mainly active in the late stage of Su 2, and the activity of fault No. 3 is weak. The SGR of faults in the study area is generally above 25%, and it has good sealing ability in the period of fault rest. The simulation of hydrocarbon generation and expulsion history of source rocks and the homogenization temperature analysis of fluid inclusions show that the main reservoir forming time of the central tectonic belt is the late stage of Su 2 to the early stage of Yinjen, and the fault No. 3 of the reservoir forming period is weak because of its weak active intensity. At the same time, along the tight slip fracture zone of the fault, the crude oil formed in the sag is not easy to migrate to the east side of the structural belt through fault No. 3, so the first and second fault terraces mainly depend on the local source rocks to supply hydrocarbon. The third fourth fault stage is the center of the sag and the difference of source rocks leads to the difference of the maturity of crude oil in different fault zones.
【作者单位】：中国石油大学(北京)地球科学学院;中国石油大学(北京)油气资源与控制国家重点实验室;中国石化中原油田分公司勘探开发科学研究院;中国石油长庆油田分公司第十采油厂;中国石油大学(北京)地球物理与信息工程学院;
【基金】：国家自然科学基金项目(41472114)~~
【分类号】：P618.13

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