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Hydrocarbon accumulation conditions and exploration potential of the Carboniferous Huanglong Formation in low-relief structural zone on the west side of Huayingshan Fault, Sichuan Basin
FU Xiaodong, DONG Jinghai, LI Wei, YUN Jianbing, GU Mingfeng, LI Wenzheng, YING Yushuang, ZHU Mao, TAN Wancang, HE Yuan, ZHU Kedan, XU Zhehang, ZHU Xinjian, XIONG Shaoyun, ZHANG Hao
Marine Origin Petroleum Geology ›› 2025, Vol. 30 ›› Issue (3) : 239-254.
PDF(15867 KB)
PDF(15867 KB)
Hydrocarbon accumulation conditions and exploration potential of the Carboniferous Huanglong Formation in low-relief structural zone on the west side of Huayingshan Fault, Sichuan Basin
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.
stratigraphic distribution / hydrocarbon accumulation conditions / exploration potential / Huanglong Formation / west side of Huayingshan Fault / low-relief structural zone / Sichuan Basin
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The Carboniferous reservoir has become the main gas producing formation in Sichuan Basin through more than 30 years of exploration and development. Recently, the new round study on stratigraphy, sedimentary facies, reservoir, source rock, structure, accumulation and trap in the eastern Sichuan Basin indicated that there are two kinds of exploration targets. One is lithologic trap, which is under the control of grain-clastic bank and heterogeneous burial dolomization in inner Carboniferous, and it shows the characteristics of heterogeneous reservoir. The other is large stratigraphic trap, which can be formed in Carboniferous wedge out area. So the Carboniferous reservoir in the Sichuan Basin has the formation condition of lithologic and stratigraphic gas pools,and 4 favorable regions and 12 prospective targets have been found, which reveals the great exploration potential. |
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The carboniferous gas reserves and production in Eastern Sichuan are abruptly increased in recent years.The important reason is a lot of highly productive gas reservoirs with strutigraphic-structural trap,such as Wubaiti,Longmenchang and Menxi reservoirs,were discovered.The structures of reservoirs are too complicated to be recognized and predicted especially for reservoir pinch-out line.According to the drilling data in past years,the gas reservoirs are mainly distributed in the areas where carboniferous residuum thickness is more than 10m.So the reservoir pinch-out boundary is fixed on the 10m isopach of carboniferous residuum thickness.(Based on drilling data and interpretation of polarity,amplitude and moveout of seismic reflector in Permian bottom.)On the basis of carboniferous structures and their structural contour lines,it is forecasted that there are 48 kinds of carboniferous stratigraphic-structural combination traps which is divided into 8 types in Eastern Sichuan.The success radio of drilling traps is up to 65%.Most traps are not drilled until now.So there is a bright prospect in Eastern Sichuan.
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