Sedimentary model,evolution and distribution of Paleogene lacustrine carbonate rocks in Yingxiongling structural belt, Q aidam Basin

被引：0

作者：

Chao Z. ^{[1
]}

Zhanguo L. ^{[1
]}

Guangyong S. ^{[1
]}

Guohui L. ^{[2
]}

Qingshun G. ^{[1
]}

Jian Z. ^{[2
]}

Senming L. ^{[1
]}

Zhiyuan X. ^{[1
]}

Yanxiong W. ^{[2
]}

Mingzhi T. ^{[1
]}

机构：

[1] PetroChina Hangzhou Research Institute of Geology, Zhejiang, Hangzhou

[2] Exploration and Development Research Institute, PetroChina Qinghai Oilfield Company, Gansu, Dunhuang

来源：

Shiyou Xuebao/Acta Petrolei Sinica | 2022年 / 43卷 / 11期

关键词：

evolution and distribution; lacustrine carbonate rocks; sedimentary model; sedimentary sequence; Yingxiongling structural belt;

D O I：

10.7623/syxb202211004a

中图分类号：

学科分类号：

摘要：

Based on field outcrops, boreholes, cores, thin sections and experimental data, this paper systematically studies the type, evolution and sedimentary model of lacustrine carbonate rocks from the Upper Member of Paleogene Xiaganchaigou Formation in Yingxiongling structural belt of Qaidam Basin and characterizes the lithofacies paleogeographical distribution combined with borehole-seismic data analysis and paleogeomorphology restoration, and points out the next favorable prospecting direction. The study shows that the Upper Member of Xiaganchaigou Formation in Yingxiongling structural belt is dominated by three types of carbonate rocks, i. e., algal limestone, granular calcareous dolomite and micritic calcareous dolomite, most of which have hybrid sedimentation characteristics, and have undergone three sedimentary evolution stages from early to late, namely brackish water, saline water and salt lake. Lacustrine carbonate reservoirs present the strongly heterogeneous properties due to the difference of mineral composition and rock texture, among which algal limestone has the best reservoir performance. There are three types of vertical lithofacies assemblages in reservoirs, which are developed in different positions of the lacustrine basin. Two sedimentary models, namely sag-uplift and gentle slope, were established. It is revealed that the lake level fluctuation and input of terrigenous detritus controlled the single layer thickness of different lithofacies, and the micro-paleogeomorphology controlled the distribution of different lithofacies assemblages. The early and late lithofacies paleogeographic characteristics of the Upper Member of Xiaganchaigou Formation show that the assemblage of micritic calcareous limestone and granular calcareous dolomite is mainly distributed in the coastal area and uplift area of Yingxi-Ganchaigou-Youyuangou gentle slope, with a superposition area of about 600 km2, indicating a favorable exploration direction for the next prospect for conventional oil and gas reservoirs. Laminated micritic calcareous dolomite is mainly distributed in the semi-deep lacustrine sag of Youyuangou and its east area, with a superposition area of up to 2500 km2, providing is a favorable exploration direction for the next prospect for unconventional intra-source oil and gas reservoirs. © 2022 Science Press. All rights reserved.

引用

页码：1558 / 1567+1622

共 31 条

[1] WU Yinye, LV Jialei, FANG Xiang, Et al., Analysis of favorable facies belts in reservoir of lacustrine carbonate rocks-hybrid sediments: case study of Paleogene in Qaidam Basin[J], Natural Gas Geoscience, 30, 8, pp. 1150-1157, (2019)
[2] ZHANG You, LI Qiang, ZHENG Xingping, Et al., Types, evolution and favorable reservoir facies belts in the Cambrian-Ordovician platform in Gucheng-Xiaotang area, eastern Tarim Basin [J], Acta Petrolei Sinica, 42, 4, pp. 447-465, (2021)
[3] LIU Zhanguo, ZHANG Yongshu, SONG Guangyong, Et al., Mixed carbonate rocks lithofacies features and reservoirs controlling mechanisms in a saline lacustrine basin in Yingxi area, Qaidam Basin, NW China[J], Petroleum Exploration and Development, 48, pp. 80-93, (2021)
[4] WANG Yanqing, LIU Zhanguo, SONG Guangyong, Et al., Genesis of lacustrine carbonate breccia and its significance for hydrocarbon exploration in Yingxi region, Qaidam Basin, NW China, Petroleum Exploration and Development, 46, 1, pp. 104-112, (2019)
[5] HU Suyun, TAO Shizhen, YAN Weipeng, Et al., Advances on continental tight oil accumulation and key technologies for exploration and development in China [J], Natural Gas Geoscience, 30, 8, pp. 1083-1093, (2019)
[6] YANG Youxing, GAO Yongjin, ZHANG Junfeng, Et al., Depositional models and differences of lacustrine carbonate rocks comparison between Qikou sag and Biyang sag[J], Geoscience, 33, 4, pp. 831-840, (2019)
[7] LUO Xiaotong, WEN Huaguo, PENG Cai, Et al., Sedimentary characteristics and high-precision sequence division of lacustrine carbonate rocks of BV Formation in L oilfield of Santos Basin, Brazil, Lithologic Reservoirs, 32, 3, pp. 68-81, (2020)
[8] ZHAO Zhengzhang, DU Jinhu, Tight oil and gas [M], pp. 1-13, (2012)
[9] ZHANG Daowei, XUE Jianqin, WU Kunyu, Et al., Shale oil reservoir characteristics and favorable area optimization in Yingxi area, Qaidam Basin, Lithologic Reservoirs, 32, 4, pp. 1-11, (2020)
[10] ZHANG Shiming, WANG Jiangong, ZHANG Yongshu, Et al., Determination of petrophysical property cutoffs of lacustrine dolomite intercrystalline pore reservoir in the Xiaganchaigou Formation, western Qaidam Basin[J], Acta Petrolei Sinica, 42, 1, pp. 45-55, (2021)

← 1 2 3 4 →