کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4695912 1351642 2012 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The study on the source of the oil seeps and bitumens in the Tianjingshan structure of the northern Longmen Mountain structure of Sichuan Basin, China
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی اقتصادی
پیش نمایش صفحه اول مقاله
The study on the source of the oil seeps and bitumens in the Tianjingshan structure of the northern Longmen Mountain structure of Sichuan Basin, China
چکیده انگلیسی

The Tianjingshan structure of the northern Longmen Mountain is located in the north of the Sichuan province, China. Two primary source rocks are present in this region, the overmature Infracambrian-Lower Cambrian source rocks and the mature Upper-Permian source rocks. Oil seeps and solid bitumens occur extensively in the Mesozoic and Paleozoic marine strata, indicating good exploration prospects in this area. However, oil-to-source correlation in the Tianjingshan structure is difficult due to both high maturity of the Lower Cambrian source rocks and severe biodegradation of oil seeps and bitumens.In this work, one oil seep from the Permian Qixia Formation and two severely degraded bitumens from the Cambrian strata in the Tianjingshan structure were correlated with their potential source rocks. Hydropyrolysis was used to release biomarkers bound to kerogen of the overmature Lower Cambrian source rock. The released biomarkers were used for the oil-to-source correlation together with those indexes resistant to thermal degradation and biodegradation. Based on the geochemical data and the petroleum geological settings of the area, it can be inferred that the Cambrian, Ordovician and Silurian bitumens with light bulk isotopic values (commonly δ13C < −34.0‰) were sourced from the Infracambrian -Lower Cambrian source rocks, while the oil in the Permian reservoir was initially charged by the oil from the Infracambrian-Lower Cambrian source rocks and then later charged by the oil from the Upper-Permian source rocks. The Infracambrian-Lower Cambrian source rocks are the major oil source in the Tianjingshan structure. The Upper-Permian source rocks only partly contributed to the reservoirs in the neighbouring strata.


► Oil seeps and bitumens occur extensively in the Tianjingshan structure.
► Oil-to-source correlation was made in the study area.
► Biomakers resistant to second alterations and released by hydropyrolysis were used.
► The biodegraded Cambrian bitumens were sourced from the Z- Є1 marine shales.
► The Permian oil was mixing oil from both Є1 and P2 source rocks.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Marine and Petroleum Geology - Volume 37, Issue 1, November 2012, Pages 147–161
نویسندگان
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