Author's Name: FU Xiaodong1,2, DONG Jinghai3, LI Wei4, YUN Jianbing3, GU Mingfeng1,2, LI Wenzheng1,2,
YING Yushuang3, ZHU Mao1,2, TAN Wanchang3, HE Yuan5, ZHU Kedan1,2,
XU Zhehang1,2, ZHU Xinjian1,2, XIONG Shaoyun1,2, ZHANG Hao1,2 |
Institution: 1. Key Laboratory of Carbonate Reservoirs, CNPC; 2. PetroChina Hangzhou Research Institute of Geology; 3. PetroChina Daqing Oilfield Com⁃
pany; |
Abstract: |
For the Carboniferous Huanglong Formation, an important natural gas production layer in Sichuan Basin, in
low-relief structural zone on the west side of Huayingshan Fault, there are still problems of unclear accumulation
conditions and undetermined favorable exploration zones due to low exploration degree. Based on exploration wells, 2D
and 3D seismic data, a new round of evaluation is conducted on the distribution of strata, lithofacies paleogeography, and
natural gas accumulation conditions of Huanglong Formation on the west side of Huayingshan Fault. The results show
that: (1) The residual strata of Huanglong Formation with thickness mainly between 10-40 m are widely distributed
(about 13 100 km2), and about 4 000 km2 according to the new seismic interpretation is added in the northern Sichuan
Basin. (2) The intertidal shoal dolomites are widely developed (about 8 200 km2), mainly in the Huanglong Member 2,
followed by the Huanglong Member 3. The newly discovered Pingchang-Bazhong shoal belt covers an area of about 2 000
km2. The thickness of dolomite reservoir of the shoal facies in HuangLong Member 2 is mainly 2-20 m. The reservoir has
good physical properties, with an average porosity of 3.90%. (3) The source rocks of Wufeng Formation-Longmaxi
Formation in the northern Sichuan Basin are widely developed covering an area of about 25 000 km2, and the total
thickness is 50-150 m in which the high-quality is 10-60 m. The source rocks of Wufeng Formation-Longmaxi Formation
and the reservoirs of Huanglong Formation form favorable reservoir combination of lower generation and upper storage.
(4) Controlled by the paleo-uplift slope zone, strata denudation zone, and large fault zone, the Huanglong Formation has
developed two large trap groups, i. e., Pingchang-Bazhong, and Guang'an-Quxian, with diverse trap types dominated by
lithological-stratigraphic traps and good preservation conditions. Four favorable exploration areas are predicted, indicating
a promising prospect for natural gas exploration. |
Keywords: stratigraphic distribution; hydrocarbon accumulation conditions; exploration potential; Huanglong Forma⁃
tion; west side of Huayingshan Fault; low-relief structural zone; Sichuan Basin |
投稿时间:
2025-06-30 |
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