NDLI: Magnetic and mineralogical characteristics of hydrocarbon microseepage above oil/gas reservoirs of Tuoku region, northern Tarim Basin, China

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Magnetic and mineralogical characteristics of hydrocarbon microseepage above oil/gas reservoirs of Tuoku region, northern Tarim Basin, China

Content Provider	Springer Nature Link
Author	Liu, Qingsheng Liu, Shugen Qu, Zan Xu, Zhongxiang Hou, Weiguo
Copyright Year	1998
Abstract	The Tuoku region in northern Tarim Basin of China is a key area for studying oil/gas reservoir rocks. The magnetic and mineralogical parameters of well cuttings from two wells, well S$_{7}$, situated on oil/gas field, and well S$_{6}$, at an oil/water interface, were measured. The two wells are located in the same structure with similar strata and types of lithology, but well S$_{6}$ is a showing well of oil and gas 5 km northwest of well S$_{7}$. The purpose of this paper is to evaluate the possibility and distribution of secondary magnetic alteration that may have occurred due to hydrocarbon migration above an oil/gas accumulation. It is concluded that the magnetism of well cuttings from major strata in well S$_{7}$, including source rocks, oil reservoir rocks and cap rocks, and in Quaternary (Q) soil is higher than that from well S$_{6}$. The Cambrian oil-bearing strata and cap rocks have even higher magnetism in well S$_{7}$. The shape and parameters of magnetic hysteresis loops indicate that soft (H $_{c}$<20 mT,H $_{s}$<0.3 T) ferrimagnetic components dominate the magnetic carriers within the strongly magnetic strata of well S$_{7}$, whereas a mixed paramagnetic and ferrimagnetic distribution occurs in well S$_{6}$ (for example, low coecivityH $_{c}$ and nonsaturating magnetized character). Analysis of heavy minerals shows that the contents of iron oxide (magnetite, maghemite and hematite) in well S$_{7}$ are often higher than those in well S$_{6}$. The magnetite content in samples of cuttings from Cambrian rocks can reach 9.7% in oil-bearing strata in well S$_{7}$, and in strata Ekm and N$_{1}$j are 1.215% and1.498%, respectively. Typical spherical magnetite grains are found within the main source rocks and the soils in well S$_{7}$. By analysis of surface microtexture and of trace element contents, we infer that the spherical magnetite is composed of aggregates of ultrafine particles that are probably authigenic magnetite formed in a hydrocarbon halo background.
Starting Page	121
Ending Page	129
Page Count	9
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	41
Issue Number	2
e-ISSN	18622801
Language	English
Publisher	Science in China Press
Publisher Date	1998-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	hydrocarbon microseepage magnetic geochemistry mineralogy oil/gas reservoir Tarim Basin Geosciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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