鄂尔多斯盆地富县—正宁地区延长组油气成藏期次

doi:10.7623/syxb201105002

石油学报 ›› 2011, Vol. 32 ›› Issue (5): 741-748.DOI: 10.7623/syxb201105002

鄂尔多斯盆地富县—正宁地区延长组油气成藏期次

梁宇 1,2 任战利 1 史政 3 赵筱燕 4 于强 1 吴晓青 1

1西北大学大陆动力学国家重点实验室陕西西安 710069； 2大庆油田有限责任公司黑龙江大庆 163000； 3中国石化无锡石油地质研究所江苏无锡 214151； 4中国石油长庆油田公司采油二厂甘肃庆阳 745100

收稿日期:2010-12-27 修回日期:2011-04-09 出版日期:2011-09-25 发布日期:2011-11-28
通讯作者: 梁宇
作者简介:梁宇，女，1984年8月生，2008年毕业于西北大学，现为西北大学在读硕士研究生，主要从事油气成藏和油气地质研究。
基金资助:
“十一五”国家科技支撑计划项目(2007BAB1701) 和国家科技重大专项(2008ZX05005)联合资助。

Classification of hydrocarbon accumulation phases of the Yanchang Formation in the Fuxian-Zhengning area, Ordos Basin

LIANG Yu 1,2 REN Zhanli 1 SHI Zheng 3 ZHAO Xiaoyan 4 YU Qiang 1 WU Xiaoqing 1

Received:2010-12-27 Revised:2011-04-09 Online:2011-09-25 Published:2011-11-28

摘要/Abstract

摘要：

鄂尔多斯盆地富县—正宁地区延长组砂岩储层主要成岩作用有压实作用、胶结作用、溶蚀作用和裂隙作用,成岩自生矿物以绿泥石、自生石英和方解石为主。根据油气包裹体寄主成岩矿物的形成时间序列,识别出两期油气包裹体：第1期油气包裹体主要分布在石英、长石粒内愈合的、未切穿次生加大边的微裂隙及石英次生加大边内侧；第2期油气包裹体分布在晚期微裂隙和晚期亮晶方解石胶结物中。油气包裹体均一温度分布呈双峰型:早期峰值温度为110～120℃；晚期峰值温度为140～150℃。对油气包裹体均一温度、盐度、密度分析表明,研究区延长组油气为“一期两幕”成藏，且具有“边致密，边成藏”的特点。结合研究区延长组热演化史及储层伊利石K-Ar 同位素定年结果研究表明,研究区主要油气成藏期为早白垩世（距今95～120 Ma）。

关键词: 油气包裹体, 成岩作用, 油气成藏时期, 延长组, 富县—正宁地区, 鄂尔多斯盆地

Abstract:

The main diagenesis of the Yanchang Formation sandstone reservoirs in the Fuxian-Zhengning area, Ordos Basin, includes compaction, cementation, corrosion and fracturation, and diagenetic authigenic minerals in these reservoirs are dominated by chlorite, authigenetic quartz and calcite. Two phases of hydrocarbon inclusions have been identified according to the time sequence of the formation of host diagenetic minerals, the earlier one composed of mostly brine inclusions that contain gaseous or liquid hydrocarbons either occurs along healed microfractures wrapped up by secondary growth edges of quartz or feldspar, or is trapped at the bottom of secondary growth edges of quartz or feldspar, while the later one mostly consisting of gas-liquid or liquid hydrocarbon inclusions occurs along the late-formed microfractures or in sparry calcite cements. Homogenization temperatures measured from brine inclusions associated with hydrocarbon ones show a bimodal distribution in the ranges with 110～120℃ and 140～150℃ as peak temperatures correspondingly, indicating the early and late formation of reservoirs, respectively. Integrated with salinity and density analyses, we suggested a “one-stage and two-episode” model for the major accumulation of hydrocarbons in the Yanchang Formation of the study area, which is characterized by “compacting while charging”. Analytical data of fluid inclusions and illitic K-Ar isotope dating, combined with burial history, also showed that the late stage of Early Cretaceous (120～95 Ma B.P.) is the major period of hydrocarbon accumulations in the Fuxian-Zhengning area.

Key words: hydrocarbon inclusion, diagenesis, hydrocarbon accumulation period, Yanchang Formation, Fuxian-Zhengning area, Ordos Basin

梁宇任战利史政赵筱燕于强吴晓青. 鄂尔多斯盆地富县—正宁地区延长组油气成藏期次[J]. 石油学报, 2011, 32(5): 741-748.

LIANG Yu REN Zhanli SHI Zheng ZHAO Xiaoyan YU Qiang WU Xiaoqing. Classification of hydrocarbon accumulation phases of the Yanchang Formation in the Fuxian-Zhengning area, Ordos Basin[J]. Editorial office of ACTA PETROLEI SINICA, 2011, 32(5): 741-748.

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鄂尔多斯盆地富县—正宁地区延长组油气成藏期次

Classification of hydrocarbon accumulation phases of the Yanchang Formation in the Fuxian-Zhengning area, Ordos Basin

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