Geological Characteristics and Petroleum Exploration of Shiqiantan Formation in Shiqiantan Sag, Junggar Basin

doi:10.7657/XJPG20240602

Abstract

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

CLC Number:

TE122.1

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.

Figures/Tables 9

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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）