四川盆地华蓥山断裂西侧低缓构造区石炭系 黄龙组成藏条件与勘探潜力

作    者:付小东1,2,董景海3,李伟4,云建兵3,谷明峰1, 2,李文正1, 2,应玉双3, 朱茂1. 2,谭万仓3,和源5,朱可丹1, 2,徐哲航1, 2,朱心健1, 2,熊绍云1, 2,张豪1, 2
单    位:1 中国石油天然气集团公司碳酸盐岩储层重点实验室;2 中国石油杭州地质研究院;3 中国石油大庆油田公司; 4 中国石油勘探开发研究院;5 中国石油西南油气田公司
基金项目:
摘    要:
石炭系黄龙组是四川盆地重要的天然气产层,其在华蓥山断裂西侧低缓构造区勘探程度低,面临成藏条件 不清,有利勘探区带不落实的问题,制约了天然气规模储量的发现。基于新老探井和二维、三维地震资料,针对华蓥 山断裂西侧黄龙组地层分布、岩相古地理与成藏条件开展系统研究。结果表明:①黄龙组残余地层分布较广,面积约 13 100 km2,川北一带新落实地层分布区约4 000 km2,厚度主要为10~40 m。②黄龙组潮间带浅滩白云岩广泛发育, 主要位于黄二段,分布面积约8 200 km2,在平昌—巴中地区预测新增滩带面积约2 000 km2;浅滩相白云岩储层厚度 主要为2~20 m,储层物性条件好,平均孔隙度为3.90%。③川北地区黄龙组成藏烃源条件好,下伏五峰组—龙马溪组 烃源岩分布面积约为25 000 km2,烃源岩总厚度为50~150 m,其中优质烃源岩厚10~60 m,可与黄龙组构成下生上储 的有利成藏组合。④受古隆起斜坡带、地层尖灭带和大型断裂带控制,黄龙组发育平昌—巴中、广安—渠县两个大型 圈闭发育带,圈闭类型多样,以岩性-地层圈闭为主,保存条件好。预测华蓥山断裂西侧低缓构造区存在4个有利勘 探区,天然气勘探前景良好。
关键词:地层分布;成藏条件;勘探潜力;黄龙组;华蓥山断裂西侧;低缓构造区;四川盆地 中

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

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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