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Distribution of natural gas in Bohai Bay Basin


Into different types of natural gas reservoirs, their respective representatives to form a typical gas station were booming, Itabashi,[link widoczny dla zalogowanych], Su Bridge field. Therefore, no matter what type of depression, depression can be as long as gas is the formation of large and medium- rich gas. 2.3 Long-term control of the central uplift and development of gas distribution and medium-sized Bohai Bay Basin have developed various types of depression,[link widoczny dla zalogowanych], the central uplift of different sizes, which control the distribution of natural gas reservoir in the depression. View of the natural gas generation, migration, accumulation of multi-phase nature, making the long-term development of uplift can be throughout the premises for hydrocarbon migration and accumulation, the formation of vertical multi-stage, different types of natural gas. Long depression in the Huanghua depression Itabashi one kilometer bridge structure, source conditions are favorable, the different shades of traps and good cap match, the best reservoir conditions, thus creating a gas reservoir under the hill, in Lower Dir three-line gas reservoir, on the third series of shallow gas pools in most sub-enrichment zone. Liaohe Depression Xinglongtai drape belt belt is formed from a hill to the sand, Dongying gas reservoir sequence, is the largest gas fields in the Liaohe. According to statistics, concave depression in the western gas reserves of the Long Depression, 86.3% of total reserves, while the eastern depression accounted for 98%. Dongpu Depression Acropolis Wenliu a belt is a bedrock of Pucheng fault block movement formed on the basis, under the third Shahejie form a multi -level, multi-types of traps, and gathered a number of times the natural gas and, where the remaining structures, development of salt anticlines Shahejie medium-sized reservoir, Block Shahejie on gas. 2.4 good regional seal is the formation of a variety of natural gas a necessary condition for the formation of cap rock on the importance of natural gas, thick, widely spread, more stable regional cap, large-scale multi-level control gas accumulation. Thickness of the instability, small range of local cover, only played a cover of a local structural role, forming part of the natural gas reservoirs. Liaohe depression, the three on the sand, sand, 2 sets of a regional cap, in western Liaoning, Liaodong Depression 2 thickness,[link widoczny dla zalogowanych], widespread distribution, which is booming Taiwan, the dawn of a happy Ling, soaring oil and gas reservoirs and other large one in the sand cover under the control of; the sand under the control of the three on the shale cap the dawn of a Huanxiling, soaring lotus (Es ), Dujiatai (Es) and other gas distribution. Huanghua depression of the regional cap and East Sec sand control one proven reserves of natural gas reserves total 67.8%, as the largest Itabashi gas reservoir, the main gas-bearing bits of sand and sand about two cover 300m thick layer of sand is one dark gray shale, not yet found a cap on the value of the gas industry. Jizhong mainly developed on the Lower Paleozoic gas reservoirs, the following Paleozoic carbonate gas reserves, the largest proven reserves of natural gas accounted for 80%, and its cover is a thick Permian mudstone Shiqianfeng (140 ~ 180m), such as the slope of the Soviet Union to bring the bridge gas reservoir. East sag a regional cap rock and sand for the sand on two mudstone , mudstone sedimentary assemblage,[link widoczny dla zalogowanych], northern Shahejie control the formation and distribution of natural gas, a local seal the sand in the sand three times three rock salt deposits in the combined control of the paper fourth-gas sand formation and distribution. 2.5 volcanic activities contribute to the formation of high temperature natural gas field in areas prone to form gas-rich region. To moderate depression of Liaohe oil and gas distribution relationship studies showed that high temperature for the gas distribution area, the ground temperature distribution for the oil and gas reservoirs, low temperature only see the oil fields. Depression in the South West is high geothermal gradient,[link widoczny dla zalogowanych], sand three, four average 4.9 ℃ / 100m, the lowest 3.15 ℃ / 100m (cold 11), a maximum of 5.78 ℃ / 100m, areas with high geothermal field distribution of two-stage, gas and other Xinglongtai as to reduce the temperature, the proven natural gas reserves became smaller, such as the Dawa gas reservoir. Volcanic area because of its unusual thermal effect of accelerating the thermal evolution of organic matter, make a little shallow buried source rocks \ Under certain conditions also can be a volcanic reservoir. If Jizhong depression have been found mostly in shallow natural gas, according to the normal ground temperature projections has not yet reached the peak of gas around dark mudstone or coal , the Soviet Union Bridge, a large and medium gas Yong'anzhen, Cao Langgu depression 5 gas wells are the source rocks of volcanic activity to warming in advance to gas phase, such causes of proven natural gas reserves of gas accounts for nearly 80% . The Sag of Bohai Bay natural gas enrichment above several conditions, more importantly is the gas-rich high-intensity gas central depression, depression and long-term development of local structures, a good regional seal. Of course, after the formation of natural gas reservoir storage conditions can not be ignored, especially in the late strong faulting. Therefore, the analysis of depression, whether accumulation of natural gas to be taken into account, to seize the key factors of gas accumulation can be effectively discovered natural gas. ( Edit NANPING) '
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