准噶尔盆地风城组烃源岩生气潜力与天然气勘探领域

doi:10.7657/XJPG20220605

摘要/Abstract

摘要：

准噶尔盆地天然气探明率低，亟需寻找战略接替领域。下二叠统风城组是盆地最重要的一套烃源岩，但对其生气潜力研究较少。利用最新钻井和地震资料，通过生烃动力学、同位素动力学、有机岩石学和盆地模拟，系统分析了风城组的生气潜力。研究表明，该套烃源岩岩性复杂，除暗色泥页岩外，还包括沉凝灰岩、含凝灰白云质泥岩、钙质泥岩、硅化白云质页岩、硅硼钠石岩等，其有机质为Ⅰ型—Ⅱ₁型，总体属于中等—好烃源岩。风城组烃源岩单位总有机碳甲烷产率高，最高可达650 mL/g。在沙湾凹陷和盆1井西凹陷，该套烃源岩在早、晚白垩世先后进入生气高峰，生气强度大于20×10⁸ m³/km²的面积达13 000 km²，具备形成大—中型气田的资源潜力。在2大凹陷周缘发现大量来自风城组的高熟油型气，也发育近源和源内有利勘探目标，有望成为准噶尔盆地天然气勘探的新领域。

关键词: 准噶尔盆地, 中央坳陷, 玛湖凹陷, 盆1井西凹陷, 沙湾凹陷, 二叠系, 风城组, 生气潜力, 天然气勘探

Abstract:

In the Junggar basin，where the percent of proved gas reserves is low，it is urgent to find strategically successive areas. The Lower Permian Fengcheng formation is the most important source rocks in the basin，but its gas generation potential has rarely been investigated. Based on the latest drilling and seismic data，the gas generation potential of the Fengcheng formation was systematically analyzed by means of hydrocarbon generation kinetics，isotope kinetics，organic petrology and basin simulation. The results show that the Fengcheng formation source rocks are complex in lithology，including dark shale，as well as sedimentary tuff，tuff-bearing dolomitic mudstone，calcareous mudstone，silicified dolomitic shale and silico-boronic sodalite，and contain the organic matters of typeⅠ-Ⅱ₁，indicating moderate-good source rocks. The methane yield of the Fengcheng formation source rocks is high with a maximum of 650 mL·g TOC. In the Shawan sag and West Pen-1 sag，the Fengcheng formation source rocks reached the peak of gas generation in the Early and Late Cretaceous respectively，and covered an area with the gas generation intensity higher than 20×10⁸ m³/km² of 13 000 km²，which suggests its resource potential of forming a medium-large gas field. A large amount of high-mature oil-type natural gas from the Fengcheng formation has been discovered in the periphery of the two sags，and favorable exploration targets are also found in near-source or inner-source traps，which are expected to become new fields for gas exploration in Junggar basin.

Key words: Junggar basin, Central depression, West Pen-1 sag, Shawan sag, Permian, Fengcheng formation, hydrocarbon generation potential, natural gas exploration

中图分类号:

TE122.23

龚德瑜, 刘海磊, 杨海波, 李宗浩, 王瑞菊, 吴卫安. 准噶尔盆地风城组烃源岩生气潜力与天然气勘探领域[J]. 新疆石油地质, 2022, 43(6): 674-683.

GONG Deyu, LIU Hailei, YANG Haibo, LI Zonghao, WANG Ruiju, WU Weian. Gas Generation Potential of Fengcheng Formation Source Rocks and Exploration Fields in Junggar Basin[J]. Xinjiang Petroleum Geology, 2022, 43(6): 674-683.

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