Distribution of Cambrian Source Rock Controlled by the Inherited Paleotopography on the Precambrian Basement in the Tarim Basin, NW China
Authors:Yuan, Haowei Chen, Shuping Dai, Kun Guo, Xiaochen Kong, Linghua Feng, Nana Zhao, Huaibo Yang, Weili
Volume:10
Published:2022
Document Type:Article
Abstract:The Cambrian source rock is a key indicator that will guide future hydrocarbon explorations in ultra-deep strata. Despite its importance, the characteristics of paleotopography on the Precambrian basement and the distribution of source rocks above it remain unclear. The seismic and borehole data, isopach data, and the unconformity analysis are used to study the relations of the Cambrian source rock distribution to the paleotopography. The consistency of the strata thickness distribution maps of the Nanhua-Cambrian sequences show that the extensive thermal subsidence lasted the whole Sinian period, and makes the paleotopography of the Precambrian basement inherited from the landform after the Nanhua continental rifting. A major transgression caused by rapid subsidence of the Tarim Basin took place during the Cambrian. Shales were deposited offshore along the slopes of a paleo-uplift on the inherited paleotopography and formed the onlap in seismic profiles. The onlap on the inherited paleotopography reflects the distribution range of Yuertusi source rocks in the Cambrian.
Author Information
Corresponding Author:Chen, SP (通讯作者)，China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing, Peoples R China.;Chen, SP (通讯作者)，China Univ Petr, Coll Geosci, Beijing, Peoples R China.
Reprint Address:Chen, SP (通讯作者)，China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing, Peoples R China.;Chen, SP (通讯作者)，China Univ Petr, Coll Geosci, Beijing, Peoples R China.
Addresses:[Yuan, Haowei; Chen, Shuping; Zhao, Huaibo] China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing, Peoples R China; [Yuan, Haowei; Chen, Shuping; Zhao, Huaibo] China Univ Petr, Coll Geosci, Beijing, Peoples R China; [Dai, Kun] CNPC Engn Technol R&D Co Ltd, Beijing, Peoples R China; [Guo, Xiaochen] Engn Co CNPC Bohai Drilling Engn Branch Co Ltd, Bohai, Peoples R China; [Kong, Linghua] PetroChina Xinjiang Oilfield Co, Karamay, Xinjiang, Peoples R China; [Feng, Nana] PetroChina Huabei Oilfield Co, Explorat & Dev Res Inst, Huabei, Peoples R China; [Yang, Weili] SINOPEC Petr Explorat & Prod Res Inst, Beijing, Peoples R China
E-mail Addresses:csp21c@163.com