东营凹陷胜坨地区深层油气成藏期及其主控因素分析

doi:10.7623/syxb201003007

石油学报 ›› 2010, Vol. 31 ›› Issue (3): 386-393.DOI: 10.7623/syxb201003007

东营凹陷胜坨地区深层油气成藏期及其主控因素分析

孙秀丽 1 陈红汉 1 宋国奇 2 蔡李梅 1 平宏伟 1

1 中国地质大学资源学院湖北武汉 430074； 2 中国石化胜利油田分公司山东东营 257015

收稿日期:2009-10-14 修回日期:2010-01-18 出版日期:2010-05-25 发布日期:2010-07-28
通讯作者: 孙秀丽
作者简介:孙秀丽，女，1984年8月生，2007年毕业于鲁东大学，现为中国地质大学（武汉）在读硕士研究生，主要从事油气成藏过程研究。
基金资助:
国家自然科学基金项目（No.40372068）资助。

Hydrocarbon accumulation period and its controlling factors in deep formations of Shengtuo area in Dongying Depression

SUN Xiuli 1 CHEN Honghan 1 SONG Guoqi 2 CAI Limei 1 PING Hongwei 1

Received:2009-10-14 Revised:2010-01-18 Online:2010-05-25 Published:2010-07-28

摘要/Abstract

摘要：

中国东部断陷盆地埋藏深度3500m以下深层是成熟勘探区重要的油气勘探潜在领域，其油气成藏控制因素与中浅层有诸多不同之处。对东营北带胜坨地区沙四段9口井50块样品的有机和无机包裹体进行了分析，探讨了成熟勘探区深层油气成藏主控因素。分析结果表明，该区沙四段发生过2期油气成藏：第一期发生在距今39～31.9Ma（对应沙三中段到东营组沉积时期），主要为发浅黄色荧光的成熟油充注；第二期发生在距今13～0Ma（对应馆陶中后期至今），主要为发蓝白色荧光的高成熟度油充注。油包裹体内的原油密度随埋深的增加呈降低趋势，这可能与地质历史时期多套源岩生成的不同成熟度原油由深部向浅层多期次运移充注和深部高温油藏内的原油再度裂解或气侵有关。储层物性分析结果显示：深部储层物性变差，油气的临界充注条件也变差；通过恢复该区古流体势，探讨了两期油气充注过程中的有利油气聚集区，建立了深层油气沿断层垂向运聚及沿连通砂体侧向运聚的成藏模式。

关键词: 胜坨地区, 断陷盆地, 油气成藏期, 流体包裹体, 主控因素, 油气成藏模式

Abstract:

The deep formations with burial depth over 3500m in the rift-subsidence basins of East China are regarded as the main potential targets for future petroleum exploration. The controlling factors for hydrocarbon migration and accumulation in the deep reservoirs are different from that of the middle-shallow reservoirs in the old exploration fields. The fluid organic and inorganic inclusion analyses of Es₄50 samples from 9 wells in Shengtuo area of Dongying Depression indicated that there were two phases of hydrocarbon charging in Es₄. In the period from 39Ma to 31.9 Ma before present, mature oil with light yellow fluorescence was charged. In the second period from 13Ma to 0 Ma before present, high-maturity oil with blue-white fluorescence was charged. The densities of crude oil in hydrocarbon inclusions decreased with the increase of burial depth, which was probably caused by the multi-stage migration and charging of hydrocarbon with different maturity from deep to shallow and might be also related to the cracking of oil at high temperature in deep reservoir or related to gas inclusion. The measurements of reservoir physical property show that deep reservoir quality is worse than that of the shallow formation in Shengtuo area, and the critical charging conditions of oil and gas also become poor in deep buried formations. The favorable regions for petroleum accumulation during hydrocarbon charging process were revealed by reconstructing the paleo-fluid potential in the studied area. The hydrocarbon migrated vertically along faults from the deep formation in this region and laterally along the sandstone bodies to the lower potential areas.

Key words: Shengtuo area, rift-subsidence basin, hydrocarbon accumulation period, fluid inclusion, controlling factors, hydrocarbon accumulation model

孙秀丽陈红汉宋国奇蔡李梅平宏伟. 东营凹陷胜坨地区深层油气成藏期及其主控因素分析[J]. 石油学报, 2010, 31(3): 386-393.

SUN Xiuli CHEN Honghan SONG Guoqi CAI Limei PING Hongwei. Hydrocarbon accumulation period and its controlling factors in deep formations of Shengtuo area in Dongying Depression[J]. Editorial office of ACTA PETROLEI SINICA, 2010, 31(3): 386-393.

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东营凹陷胜坨地区深层油气成藏期及其主控因素分析

Hydrocarbon accumulation period and its controlling factors in deep formations of Shengtuo area in Dongying Depression

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