A fossil oil-reservoir and the gas origin in the Lower Sha-4 Member of the Well Fengshen-1 area,the North Dongying zone of the Jiyang Depression

LI  Yan-Jun; SONG  Guo-Qi; LI  Wen-Tao; GUO  Rui-Chao; YANG  Xian-Cheng; CHEN  Yi-Cai; LUO  Wen-Jun-

doi:10.11743/ogg20100206

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A fossil oil-reservoir and the gas origin in the Lower Sha-4 Member of the Well Fengshen-1 area,the North Dongying zone of the Jiyang Depression
Vol. 31, Issue 2, Pages: 173-179(2010)
Online First：26 April 2010，

Published：2010
DOI： 10.11743/ogg20100206
稿件说明：

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DOI：

LI Yan-Jun, SONG Guo-Qi, LI Wen-Tao, et al. A fossil oil-reservoir and the gas origin in the Lower Sha-4 Member of the Well Fengshen-1 area,the North Dongying zone of the Jiyang Depression[J]. 2010, 31(2): 173-179. DOI： 10.11743/ogg20100206.

摘要

济阳坳陷东营凹陷北带丰深1井区深层古近系沙四段下亚段以产出凝析油气为特征。根据天然气烃类气体组成、氮气含量、气体碳同位素、储层显微荧光薄片观察与测试结果以及热模拟实验结果综合分析

丰深1井区天然气属于原油裂解气

且储层孔隙大量分布热蚀变焦沥青。结合储层地温史和烃源岩生烃史

证实该区深层沙四下砂砾岩体存在古近纪末期(Es1末)古油藏

并在新近纪明化镇组沉积期至今(Nm—Q)因热力作用发生裂解

形成现今的深层凝析气藏。同时发现

在古油藏边缘

如丰深3井区存在源岩干酪根裂解与原油裂解成因的混合气;储层大量微观泄压缝的存在是凝析气藏保持正常压力系统的主要原因。

Abstract

The deep interval of Lower Sha-Member 4 is characterized by producing condensate oil and gas in the Well Fengshen-1 area

the North Dongying zone

Bohai bay Basin.According to a comprehensive analysis of hydrocarbon gas composition

nitrogen content

gas carbon isotope

microfluorometric reservoir section and thermal simulation experiment

it is revealed that the gas in this area belongs to a type of crude-cracked gas

and that pyrobitumen generated by thermal alteration occurs widely in the reservoir pores.In combination with the geothermal history of the reservoir rocks and hydrocarbon generation history of the source rocks

it can be verified that a latest Paleogene(Es1)fossil oil-reservoir existed in the deep Sha-Member 4 sandstone-conglomerate body

the oil in which was thermally cracked from Neogene Minghuazhen to the present time(Nm-Q)

resulting in the formation of a deep condensate gas reservoir.It is also found that a type of gas mixed by source-kerogen-cracked gas and oil-cracked gas occurs along the fossil oil-reservoir margin

such as the Well Fengshen-3 area

and that a lot of releasing microfractures in the reservoir rocks are the main factor to maintain a normal pressure system in the condensate gas reservoir.