准噶尔盆地石钱滩凹陷石钱滩组地质特征及油气勘探

doi:10.7657/XJPG20240602

摘要/Abstract

摘要：

准噶尔盆地东部隆起石钱滩凹陷东部缓坡带S3井在石炭系石钱滩组获高产工业气流，石钱滩组天然气藏勘探获重要突破，进一步证实准噶尔盆地东部发育海相碎屑岩天然气富集凹陷。为明确石钱滩凹陷石钱滩组地质特征及油气勘探潜力，综合地震、录井、测井、岩心和分析化验资料，开展了石钱滩凹陷烃源岩、储集层及油气成藏综合研究。研究区石钱滩组发育2套烃源岩，烃源岩整体厚度大，品质好，具备发育大规模气藏的物质基础；石钱滩组储集层为典型致密砂砾岩储集层，发育南、北双向物源的扇三角洲沉积体系，扇三角洲前缘大规模砂体主要分布在环凹斜坡区；石钱滩组发育近源致密砂岩岩性气藏，石钱滩组是目前石钱滩凹陷石炭系天然气勘探的重点层系，气藏源储匹配关系好，受近源与砂体规模共同控制。

关键词: 准噶尔盆地, 石钱滩凹陷, 石炭系, 石钱滩组, 烃源岩, 沉积储集层, 成藏模式

Abstract:

Well S3 drilled in the gentle slope zone of the eastern Shiqiantan sag in the east uplift of the Junggar basin, has produced a high-yield industrial gas flow from the Carboniferous Shiqiantan formation. This significant breakthrough in natural gas exploration in the Shiqiantan formation further confirms the presence of a marine clastic-rock sag rich in natural gas in the eastern Junggar basin. To better understand the geological characteristics and petroleum exploration potential of the Shiqiantan formation in the Shiqiantan sag, a comprehensive study of source rocks, reservoirs, and hydrocarbon accumulation was conducted using seismic, drilling, logging, core, and testing data. The Shiqiantan formation in the study area contains two sets of source rocks, which are generally thick and of high quality, providing a solid material basis for large-scale gas reservoir development. The reservoirs in the Shiqiantan formation are typically composed of tight sandy conglomerate in which a fan delta system with bidirectional provenances in the south and north is found. Large scale delta-front sand bodies are mainly distributed in the slope zone around the sag. The Shiqiantan formation hosts near-source tight lithological sandstone gas reservoirs, making it the key target for gas exploration in the Carboniferous of the Shiqiantan sag. It has favorable source-reservoir assemblages jointly controlled by proximity to the source and sand body size.

Key words: Junggar basin, Shiqiantan sag, Carboniferous, Shiqiantan formation, source rock, reservoir, hydrocarbon accumulation model

中图分类号:

TE122.1

何昌松, 王秉乾, 魏双宝, 蒲振山, 王力龙, 马强, 张伟. 准噶尔盆地石钱滩凹陷石钱滩组地质特征及油气勘探[J]. 新疆石油地质, 2024, 45(6): 642-649.

HE Changsong, WANG Bingqian, WEI Shuangbao, PU Zhenshan, WANG Lilong, MA Qiang, ZHANG Wei. Geological Characteristics and Petroleum Exploration of Shiqiantan Formation in Shiqiantan Sag, Junggar Basin[J]. Xinjiang Petroleum Geology, 2024, 45(6): 642-649.

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井名	总有机碳含量/%	生烃潜量/（mg·g^-1）	氯仿沥青“A”含量/%	热解峰温/℃	氢指数/（mg·g^-1）	镜质体反射率/%
S1井	1.11~2.48（1.31）	0.12~1.07（0.61）	0.04~0.12（0.08）	473~492（479）	27.00~53.00（37.00）	1.48~1.68（1.61）
S2井	1.23~1.83（1.62）	1.12~2.31（1.75）		452~453（452）	68.29~95.00（79.93）	1.21~1.61（1.18）
S4井	0.78~1.93（1.19）	0.81~3.31（1.61）	0.05~0.11（0.06）	464~479（473）	80.80~136.90（107.90）	0.65~1.41（1.13）
S3井	0.67~6.59（1.14）	0.07~10.25（0.61）		430~497（480）	4.89~105.90（48.10）	0.57~1.74（1.13）

井名	井段/m	岩性	孔隙度/%	渗透率/mD
S1井	3 914—3 918	砂砾岩	2.3~5.6（4.2）	0.001~1.390（0.170）
S2井	4 525—4 533	砂砾岩	2.5~4.8（3.1）	0.005~1.220（0.680）
S3井	3 839—3 842	砂砾岩	2.8~9.3（6.0）	0.001~1.260（0.190）
S4井	3 555—3 563	粉—细砂岩	5.0~6.5（5.5）	0.003~0.600（0.200）